diff --git a/package-lock.json b/package-lock.json
index 30eabf9..c0461ad 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,10 +20,10 @@
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-        "jsesc": "2.5.1",
-        "lodash": "4.17.10",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.5",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
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@@ -69,9 +69,9 @@
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       "dev": true,
       "requires": {
-        "chalk": "2.4.1",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.0"
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@@ -80,7 +80,7 @@
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           "dev": true,
           "requires": {
-            "color-convert": "1.9.1"
+            "color-convert": "^1.9.0"
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@@ -89,9 +89,9 @@
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           "dev": true,
           "requires": {
-            "ansi-styles": "3.2.1",
-            "escape-string-regexp": "1.0.5",
-            "supports-color": "5.4.0"
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
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@@ -106,7 +106,7 @@
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           "dev": true,
           "requires": {
-            "has-flag": "3.0.0"
+            "has-flag": "^3.0.0"
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@@ -126,7 +126,7 @@
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         "@babel/parser": "7.0.0-beta.49",
         "@babel/types": "7.0.0-beta.49",
-        "lodash": "4.17.10"
+        "lodash": "^4.17.5"
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@@ -141,10 +141,10 @@
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         "@babel/types": "7.0.0-beta.49",
-        "debug": "3.1.0",
-        "globals": "11.5.0",
-        "invariant": "2.2.4",
-        "lodash": "4.17.10"
+        "debug": "^3.1.0",
+        "globals": "^11.1.0",
+        "invariant": "^2.2.0",
+        "lodash": "^4.17.5"
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@@ -170,9 +170,9 @@
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       "dev": true,
       "requires": {
-        "esutils": "2.0.2",
-        "lodash": "4.17.10",
-        "to-fast-properties": "2.0.0"
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.5",
+        "to-fast-properties": "^2.0.0"
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@@ -207,7 +207,7 @@
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       "dev": true,
       "requires": {
-        "mime-types": "2.1.18",
+        "mime-types": "~2.1.18",
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@@ -223,7 +223,7 @@
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       "dev": true,
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+        "acorn": "^3.0.4"
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@@ -240,7 +240,7 @@
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       "dev": true,
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-        "acorn": "3.3.0"
+        "acorn": "^3.1.0"
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@@ -269,8 +269,9 @@
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       "dev": true,
+      "optional": true,
       "requires": {
-        "es6-promisify": "5.0.0"
+        "es6-promisify": "^5.0.0"
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@@ -279,10 +280,10 @@
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-        "fast-deep-equal": "1.1.0",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.3.1"
+        "co": "^4.6.0",
+        "fast-deep-equal": "^1.0.0",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.3.0"
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@@ -296,10 +297,11 @@
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       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
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+      "optional": true,
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-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
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@@ -315,11 +317,11 @@
       "dev": true,
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       "requires": {
-        "bitsyntax": "0.0.4",
-        "bluebird": "3.5.1",
+        "bitsyntax": "~0.0.4",
+        "bluebird": "^3.4.6",
         "buffer-more-ints": "0.0.2",
-        "readable-stream": "1.1.14",
-        "safe-buffer": "5.1.2"
+        "readable-stream": "1.x >=1.1.9",
+        "safe-buffer": "^5.0.1"
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@@ -336,10 +338,10 @@
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-            "inherits": "2.0.3",
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.1",
             "isarray": "0.0.1",
-            "string_decoder": "0.10.31"
+            "string_decoder": "~0.10.x"
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@@ -390,8 +392,8 @@
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       "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
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@@ -400,7 +402,7 @@
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       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
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@@ -409,7 +411,7 @@
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       "dev": true,
       "requires": {
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+        "arr-flatten": "^1.0.1"
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@@ -436,8 +438,8 @@
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       "dev": true,
       "requires": {
-        "define-properties": "1.1.2",
-        "es-abstract": "1.12.0"
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
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@@ -452,7 +454,7 @@
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       "dev": true,
       "requires": {
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+        "array-uniq": "^1.0.1"
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@@ -581,7 +583,7 @@
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@@ -592,9 +594,9 @@
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-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
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+        "js-tokens": "^3.0.2"
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@@ -603,25 +605,25 @@
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-        "debug": "2.6.9",
-        "json5": "0.5.1",
-        "lodash": "4.17.10",
-        "minimatch": "3.0.4",
-        "path-is-absolute": "1.0.1",
-        "private": "0.1.8",
-        "slash": "1.0.0",
-        "source-map": "0.5.7"
+        "babel-code-frame": "^6.26.0",
+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.8",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.7"
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-        "jsesc": "1.3.0",
-        "lodash": "4.17.10",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "detect-indent": "^4.0.0",
+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
+        "source-map": "^0.5.7",
+        "trim-right": "^1.0.1"
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@@ -646,9 +648,9 @@
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-        "babel-types": "6.26.0"
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@@ -657,9 +659,9 @@
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-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-explode-assignable-expression": "^6.24.1",
+        "babel-runtime": "^6.22.0",
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@@ -668,9 +670,9 @@
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-        "babel-types": "6.26.0",
-        "esutils": "2.0.2"
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "esutils": "^2.0.2"
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@@ -679,9 +681,9 @@
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-        "babel-types": "6.26.0"
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@@ -690,10 +692,10 @@
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-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-bindify-decorators": "^6.24.1",
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-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-get-function-arity": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
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       "dev": true,
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-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
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@@ -725,11 +727,11 @@
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-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
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-        "babel-template": "6.26.0"
+        "babel-runtime": "^6.22.0",
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@@ -748,7 +750,7 @@
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       "dev": true,
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@@ -841,9 +843,9 @@
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-        "babel-plugin-syntax-async-generators": "6.13.0",
-        "babel-runtime": "6.26.0"
+        "babel-helper-remap-async-to-generator": "^6.24.1",
+        "babel-plugin-syntax-async-generators": "^6.5.0",
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@@ -852,9 +854,9 @@
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-        "babel-plugin-syntax-async-functions": "6.13.0",
-        "babel-runtime": "6.26.0"
+        "babel-helper-remap-async-to-generator": "^6.24.1",
+        "babel-plugin-syntax-async-functions": "^6.8.0",
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@@ -863,9 +865,9 @@
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-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-plugin-syntax-class-constructor-call": "^6.18.0",
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-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-plugin-syntax-class-properties": "^6.8.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
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@@ -886,11 +888,11 @@
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-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-explode-class": "^6.24.1",
+        "babel-plugin-syntax-decorators": "^6.13.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-types": "^6.24.1"
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@@ -899,8 +901,8 @@
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       "dev": true,
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-        "babel-runtime": "6.26.0"
+        "babel-plugin-syntax-do-expressions": "^6.8.0",
+        "babel-runtime": "^6.22.0"
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@@ -909,9 +911,9 @@
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-        "babel-plugin-syntax-exponentiation-operator": "6.13.0",
-        "babel-runtime": "6.26.0"
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+        "encodeurl": "~1.0.1",
+        "escape-html": "~1.0.3",
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-        "follow-redirects": "1.5.0",
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-        "signal-exit": "3.0.2"
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@@ -5809,7 +5847,7 @@
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-        "is-stream": "1.1.0"
+        "encoding": "^0.1.11",
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@@ -6175,8 +6213,8 @@
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-            "smart-buffer": "1.1.15"
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@@ -6196,13 +6234,15 @@
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-      "dev": true
+      "dev": true,
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       "integrity": "sha1-z1mU4v0mjQD1zw+nZ6CBae2wfsA=",
       "dev": true,
+      "optional": true,
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@@ -6235,7 +6275,8 @@
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-      "dev": true
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@@ -6243,7 +6284,7 @@
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       "dev": true,
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-        "abbrev": "1.0.9"
+        "abbrev": "1"
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@@ -6252,10 +6293,10 @@
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-        "is-builtin-module": "1.0.0",
-        "semver": "4.3.6",
-        "validate-npm-package-license": "3.0.3"
+        "hosted-git-info": "^2.1.4",
+        "is-builtin-module": "^1.0.0",
+        "semver": "2 || 3 || 4 || 5",
+        "validate-npm-package-license": "^3.0.1"
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@@ -6264,7 +6305,7 @@
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       "dev": true,
       "requires": {
-        "remove-trailing-separator": "1.1.0"
+        "remove-trailing-separator": "^1.0.1"
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@@ -6285,43 +6326,44 @@
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-        "signal-exit": "3.0.2",
-        "spawn-wrap": "1.4.2",
-        "test-exclude": "4.2.1",
+        "archy": "^1.0.0",
+        "arrify": "^1.0.1",
+        "caching-transform": "^1.0.0",
+        "convert-source-map": "^1.5.1",
+        "debug-log": "^1.0.1",
+        "default-require-extensions": "^1.0.0",
+        "find-cache-dir": "^0.1.1",
+        "find-up": "^2.1.0",
+        "foreground-child": "^1.5.3",
+        "glob": "^7.0.6",
+        "istanbul-lib-coverage": "^1.2.0",
+        "istanbul-lib-hook": "^1.1.0",
+        "istanbul-lib-instrument": "^2.1.0",
+        "istanbul-lib-report": "^1.1.3",
+        "istanbul-lib-source-maps": "^1.2.5",
+        "istanbul-reports": "^1.4.1",
+        "md5-hex": "^1.2.0",
+        "merge-source-map": "^1.1.0",
+        "micromatch": "^3.1.10",
+        "mkdirp": "^0.5.0",
+        "resolve-from": "^2.0.0",
+        "rimraf": "^2.6.2",
+        "signal-exit": "^3.0.1",
+        "spawn-wrap": "^1.4.2",
+        "test-exclude": "^4.2.0",
         "yargs": "11.1.0",
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           "version": "0.1.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
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-            "longest": "1.0.1",
-            "repeat-string": "1.6.1"
+            "kind-of": "^3.0.2",
+            "longest": "^1.0.1",
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@@ -6339,7 +6381,7 @@
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           "requires": {
-            "default-require-extensions": "1.0.0"
+            "default-require-extensions": "^1.0.0"
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@@ -6397,13 +6439,13 @@
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-            "isobject": "3.0.1",
-            "mixin-deep": "1.3.1",
-            "pascalcase": "0.1.1"
+            "cache-base": "^1.0.1",
+            "class-utils": "^0.3.5",
+            "component-emitter": "^1.2.1",
+            "define-property": "^1.0.0",
+            "isobject": "^3.0.1",
+            "mixin-deep": "^1.2.0",
+            "pascalcase": "^0.1.1"
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@@ -6411,7 +6453,7 @@
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               "dev": true,
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-                "is-descriptor": "1.0.2"
+                "is-descriptor": "^1.0.0"
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@@ -6419,7 +6461,7 @@
               "bundled": true,
               "dev": true,
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-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
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@@ -6427,7 +6469,7 @@
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               "dev": true,
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-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
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@@ -6435,9 +6477,9 @@
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-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
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@@ -6452,7 +6494,7 @@
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-            "balanced-match": "1.0.0",
+            "balanced-match": "^1.0.0",
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@@ -6461,16 +6503,16 @@
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-            "snapdragon-node": "2.1.1",
-            "split-string": "3.1.0",
-            "to-regex": "3.0.2"
+            "arr-flatten": "^1.1.0",
+            "array-unique": "^0.3.2",
+            "extend-shallow": "^2.0.1",
+            "fill-range": "^4.0.0",
+            "isobject": "^3.0.1",
+            "repeat-element": "^1.1.2",
+            "snapdragon": "^0.8.1",
+            "snapdragon-node": "^2.0.1",
+            "split-string": "^3.0.2",
+            "to-regex": "^3.0.1"
           },
           "dependencies": {
             "extend-shallow": {
@@ -6478,7 +6520,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -6493,15 +6535,15 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "collection-visit": "1.0.0",
-            "component-emitter": "1.2.1",
-            "get-value": "2.0.6",
-            "has-value": "1.0.0",
-            "isobject": "3.0.1",
-            "set-value": "2.0.0",
-            "to-object-path": "0.3.0",
-            "union-value": "1.0.0",
-            "unset-value": "1.0.0"
+            "collection-visit": "^1.0.0",
+            "component-emitter": "^1.2.1",
+            "get-value": "^2.0.6",
+            "has-value": "^1.0.0",
+            "isobject": "^3.0.1",
+            "set-value": "^2.0.0",
+            "to-object-path": "^0.3.0",
+            "union-value": "^1.0.0",
+            "unset-value": "^1.0.0"
           }
         },
         "caching-transform": {
@@ -6509,9 +6551,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "md5-hex": "1.3.0",
-            "mkdirp": "0.5.1",
-            "write-file-atomic": "1.3.4"
+            "md5-hex": "^1.2.0",
+            "mkdirp": "^0.5.1",
+            "write-file-atomic": "^1.1.4"
           }
         },
         "camelcase": {
@@ -6526,8 +6568,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "align-text": "0.1.4",
-            "lazy-cache": "1.0.4"
+            "align-text": "^0.1.3",
+            "lazy-cache": "^1.0.3"
           }
         },
         "class-utils": {
@@ -6535,10 +6577,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arr-union": "3.1.0",
-            "define-property": "0.2.5",
-            "isobject": "3.0.1",
-            "static-extend": "0.1.2"
+            "arr-union": "^3.1.0",
+            "define-property": "^0.2.5",
+            "isobject": "^3.0.0",
+            "static-extend": "^0.1.1"
           },
           "dependencies": {
             "define-property": {
@@ -6546,7 +6588,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             }
           }
@@ -6557,8 +6599,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "center-align": "0.1.3",
-            "right-align": "0.1.3",
+            "center-align": "^0.1.1",
+            "right-align": "^0.1.1",
             "wordwrap": "0.0.2"
           },
           "dependencies": {
@@ -6580,8 +6622,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "map-visit": "1.0.0",
-            "object-visit": "1.0.1"
+            "map-visit": "^1.0.0",
+            "object-visit": "^1.0.0"
           }
         },
         "commondir": {
@@ -6614,8 +6656,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "lru-cache": "4.1.3",
-            "which": "1.3.1"
+            "lru-cache": "^4.0.1",
+            "which": "^1.2.9"
           }
         },
         "debug": {
@@ -6646,7 +6688,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "strip-bom": "2.0.0"
+            "strip-bom": "^2.0.0"
           }
         },
         "define-property": {
@@ -6654,8 +6696,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-descriptor": "1.0.2",
-            "isobject": "3.0.1"
+            "is-descriptor": "^1.0.2",
+            "isobject": "^3.0.1"
           },
           "dependencies": {
             "is-accessor-descriptor": {
@@ -6663,7 +6705,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-data-descriptor": {
@@ -6671,7 +6713,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-descriptor": {
@@ -6679,9 +6721,9 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-accessor-descriptor": "1.0.0",
-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
               }
             },
             "kind-of": {
@@ -6696,7 +6738,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-arrayish": "0.2.1"
+            "is-arrayish": "^0.2.1"
           }
         },
         "execa": {
@@ -6704,13 +6746,13 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "cross-spawn": "5.1.0",
-            "get-stream": "3.0.0",
-            "is-stream": "1.1.0",
-            "npm-run-path": "2.0.2",
-            "p-finally": "1.0.0",
-            "signal-exit": "3.0.2",
-            "strip-eof": "1.0.0"
+            "cross-spawn": "^5.0.1",
+            "get-stream": "^3.0.0",
+            "is-stream": "^1.1.0",
+            "npm-run-path": "^2.0.0",
+            "p-finally": "^1.0.0",
+            "signal-exit": "^3.0.0",
+            "strip-eof": "^1.0.0"
           },
           "dependencies": {
             "cross-spawn": {
@@ -6718,9 +6760,9 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "lru-cache": "4.1.3",
-                "shebang-command": "1.2.0",
-                "which": "1.3.1"
+                "lru-cache": "^4.0.1",
+                "shebang-command": "^1.2.0",
+                "which": "^1.2.9"
               }
             }
           }
@@ -6730,13 +6772,13 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "debug": "2.6.9",
-            "define-property": "0.2.5",
-            "extend-shallow": "2.0.1",
-            "posix-character-classes": "0.1.1",
-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "debug": "^2.3.3",
+            "define-property": "^0.2.5",
+            "extend-shallow": "^2.0.1",
+            "posix-character-classes": "^0.1.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.1"
           },
           "dependencies": {
             "debug": {
@@ -6752,7 +6794,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             },
             "extend-shallow": {
@@ -6760,7 +6802,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -6770,8 +6812,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "assign-symbols": "1.0.0",
-            "is-extendable": "1.0.1"
+            "assign-symbols": "^1.0.0",
+            "is-extendable": "^1.0.1"
           },
           "dependencies": {
             "is-extendable": {
@@ -6779,7 +6821,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-plain-object": "2.0.4"
+                "is-plain-object": "^2.0.4"
               }
             }
           }
@@ -6789,14 +6831,14 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "array-unique": "0.3.2",
-            "define-property": "1.0.0",
-            "expand-brackets": "2.1.4",
-            "extend-shallow": "2.0.1",
-            "fragment-cache": "0.2.1",
-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "array-unique": "^0.3.2",
+            "define-property": "^1.0.0",
+            "expand-brackets": "^2.1.4",
+            "extend-shallow": "^2.0.1",
+            "fragment-cache": "^0.2.1",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.1"
           },
           "dependencies": {
             "define-property": {
@@ -6804,7 +6846,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "1.0.2"
+                "is-descriptor": "^1.0.0"
               }
             },
             "extend-shallow": {
@@ -6812,7 +6854,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             },
             "is-accessor-descriptor": {
@@ -6820,7 +6862,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-data-descriptor": {
@@ -6828,7 +6870,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-descriptor": {
@@ -6836,9 +6878,9 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-accessor-descriptor": "1.0.0",
-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
               }
             },
             "kind-of": {
@@ -6853,10 +6895,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "2.0.1",
-            "is-number": "3.0.0",
-            "repeat-string": "1.6.1",
-            "to-regex-range": "2.1.1"
+            "extend-shallow": "^2.0.1",
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1",
+            "to-regex-range": "^2.1.0"
           },
           "dependencies": {
             "extend-shallow": {
@@ -6864,7 +6906,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -6874,9 +6916,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "commondir": "1.0.1",
-            "mkdirp": "0.5.1",
-            "pkg-dir": "1.0.0"
+            "commondir": "^1.0.1",
+            "mkdirp": "^0.5.1",
+            "pkg-dir": "^1.0.0"
           }
         },
         "find-up": {
@@ -6884,7 +6926,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "locate-path": "2.0.0"
+            "locate-path": "^2.0.0"
           }
         },
         "for-in": {
@@ -6897,8 +6939,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "cross-spawn": "4.0.2",
-            "signal-exit": "3.0.2"
+            "cross-spawn": "^4",
+            "signal-exit": "^3.0.0"
           }
         },
         "fragment-cache": {
@@ -6906,7 +6948,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "map-cache": "0.2.2"
+            "map-cache": "^0.2.2"
           }
         },
         "fs.realpath": {
@@ -6934,12 +6976,12 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
           }
         },
         "graceful-fs": {
@@ -6952,10 +6994,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "async": "1.5.2",
-            "optimist": "0.6.1",
-            "source-map": "0.4.4",
-            "uglify-js": "2.8.29"
+            "async": "^1.4.0",
+            "optimist": "^0.6.1",
+            "source-map": "^0.4.4",
+            "uglify-js": "^2.6"
           },
           "dependencies": {
             "source-map": {
@@ -6963,7 +7005,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "amdefine": "1.0.1"
+                "amdefine": ">=0.0.4"
               }
             }
           }
@@ -6973,9 +7015,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "get-value": "2.0.6",
-            "has-values": "1.0.0",
-            "isobject": "3.0.1"
+            "get-value": "^2.0.6",
+            "has-values": "^1.0.0",
+            "isobject": "^3.0.0"
           }
         },
         "has-values": {
@@ -6983,8 +7025,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-number": "3.0.0",
-            "kind-of": "4.0.0"
+            "is-number": "^3.0.0",
+            "kind-of": "^4.0.0"
           },
           "dependencies": {
             "kind-of": {
@@ -6992,7 +7034,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-buffer": "1.1.6"
+                "is-buffer": "^1.1.5"
               }
             }
           }
@@ -7012,8 +7054,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "once": "1.4.0",
-            "wrappy": "1.0.2"
+            "once": "^1.3.0",
+            "wrappy": "1"
           }
         },
         "inherits": {
@@ -7031,7 +7073,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "kind-of": "3.2.2"
+            "kind-of": "^3.0.2"
           }
         },
         "is-arrayish": {
@@ -7049,7 +7091,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "builtin-modules": "1.1.1"
+            "builtin-modules": "^1.0.0"
           }
         },
         "is-data-descriptor": {
@@ -7057,7 +7099,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "kind-of": "3.2.2"
+            "kind-of": "^3.0.2"
           }
         },
         "is-descriptor": {
@@ -7065,9 +7107,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-accessor-descriptor": "0.1.6",
-            "is-data-descriptor": "0.1.4",
-            "kind-of": "5.1.0"
+            "is-accessor-descriptor": "^0.1.6",
+            "is-data-descriptor": "^0.1.4",
+            "kind-of": "^5.0.0"
           },
           "dependencies": {
             "kind-of": {
@@ -7092,7 +7134,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "kind-of": "3.2.2"
+            "kind-of": "^3.0.2"
           }
         },
         "is-odd": {
@@ -7100,7 +7142,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-number": "4.0.0"
+            "is-number": "^4.0.0"
           },
           "dependencies": {
             "is-number": {
@@ -7115,7 +7157,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "isobject": "3.0.1"
+            "isobject": "^3.0.1"
           }
         },
         "is-stream": {
@@ -7158,7 +7200,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "append-transform": "0.4.0"
+            "append-transform": "^0.4.0"
           }
         },
         "istanbul-lib-report": {
@@ -7166,10 +7208,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "istanbul-lib-coverage": "1.2.0",
-            "mkdirp": "0.5.1",
-            "path-parse": "1.0.5",
-            "supports-color": "3.2.3"
+            "istanbul-lib-coverage": "^1.1.2",
+            "mkdirp": "^0.5.1",
+            "path-parse": "^1.0.5",
+            "supports-color": "^3.1.2"
           },
           "dependencies": {
             "has-flag": {
@@ -7182,7 +7224,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "has-flag": "1.0.0"
+                "has-flag": "^1.0.0"
               }
             }
           }
@@ -7192,11 +7234,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "debug": "3.1.0",
-            "istanbul-lib-coverage": "1.2.0",
-            "mkdirp": "0.5.1",
-            "rimraf": "2.6.2",
-            "source-map": "0.5.7"
+            "debug": "^3.1.0",
+            "istanbul-lib-coverage": "^1.2.0",
+            "mkdirp": "^0.5.1",
+            "rimraf": "^2.6.1",
+            "source-map": "^0.5.3"
           }
         },
         "istanbul-reports": {
@@ -7204,7 +7246,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "handlebars": "4.0.11"
+            "handlebars": "^4.0.3"
           }
         },
         "kind-of": {
@@ -7212,7 +7254,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-buffer": "1.1.6"
+            "is-buffer": "^1.1.5"
           }
         },
         "lazy-cache": {
@@ -7226,7 +7268,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "invert-kv": "1.0.0"
+            "invert-kv": "^1.0.0"
           }
         },
         "load-json-file": {
@@ -7234,11 +7276,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "parse-json": "2.2.0",
-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1",
-            "strip-bom": "2.0.0"
+            "graceful-fs": "^4.1.2",
+            "parse-json": "^2.2.0",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0",
+            "strip-bom": "^2.0.0"
           }
         },
         "locate-path": {
@@ -7246,8 +7288,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-locate": "2.0.0",
-            "path-exists": "3.0.0"
+            "p-locate": "^2.0.0",
+            "path-exists": "^3.0.0"
           },
           "dependencies": {
             "path-exists": {
@@ -7260,15 +7302,16 @@
         "longest": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "lru-cache": {
           "version": "4.1.3",
           "bundled": true,
           "dev": true,
           "requires": {
-            "pseudomap": "1.0.2",
-            "yallist": "2.1.2"
+            "pseudomap": "^1.0.2",
+            "yallist": "^2.1.2"
           }
         },
         "map-cache": {
@@ -7281,7 +7324,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "object-visit": "1.0.1"
+            "object-visit": "^1.0.0"
           }
         },
         "md5-hex": {
@@ -7289,7 +7332,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "md5-o-matic": "0.1.1"
+            "md5-o-matic": "^0.1.1"
           }
         },
         "md5-o-matic": {
@@ -7302,7 +7345,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "mimic-fn": "1.2.0"
+            "mimic-fn": "^1.0.0"
           }
         },
         "merge-source-map": {
@@ -7310,7 +7353,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "source-map": "0.6.1"
+            "source-map": "^0.6.1"
           },
           "dependencies": {
             "source-map": {
@@ -7325,19 +7368,19 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arr-diff": "4.0.0",
-            "array-unique": "0.3.2",
-            "braces": "2.3.2",
-            "define-property": "2.0.2",
-            "extend-shallow": "3.0.2",
-            "extglob": "2.0.4",
-            "fragment-cache": "0.2.1",
-            "kind-of": "6.0.2",
-            "nanomatch": "1.2.9",
-            "object.pick": "1.3.0",
-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "braces": "^2.3.1",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "extglob": "^2.0.4",
+            "fragment-cache": "^0.2.1",
+            "kind-of": "^6.0.2",
+            "nanomatch": "^1.2.9",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.2"
           },
           "dependencies": {
             "kind-of": {
@@ -7357,7 +7400,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "brace-expansion": "1.1.11"
+            "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
@@ -7370,8 +7413,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "for-in": "1.0.2",
-            "is-extendable": "1.0.1"
+            "for-in": "^1.0.2",
+            "is-extendable": "^1.0.1"
           },
           "dependencies": {
             "is-extendable": {
@@ -7379,7 +7422,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-plain-object": "2.0.4"
+                "is-plain-object": "^2.0.4"
               }
             }
           }
@@ -7402,18 +7445,18 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arr-diff": "4.0.0",
-            "array-unique": "0.3.2",
-            "define-property": "2.0.2",
-            "extend-shallow": "3.0.2",
-            "fragment-cache": "0.2.1",
-            "is-odd": "2.0.0",
-            "is-windows": "1.0.2",
-            "kind-of": "6.0.2",
-            "object.pick": "1.3.0",
-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "fragment-cache": "^0.2.1",
+            "is-odd": "^2.0.0",
+            "is-windows": "^1.0.2",
+            "kind-of": "^6.0.2",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.1"
           },
           "dependencies": {
             "kind-of": {
@@ -7428,10 +7471,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "hosted-git-info": "2.6.0",
-            "is-builtin-module": "1.0.0",
-            "semver": "5.5.0",
-            "validate-npm-package-license": "3.0.3"
+            "hosted-git-info": "^2.1.4",
+            "is-builtin-module": "^1.0.0",
+            "semver": "2 || 3 || 4 || 5",
+            "validate-npm-package-license": "^3.0.1"
           }
         },
         "npm-run-path": {
@@ -7439,7 +7482,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "path-key": "2.0.1"
+            "path-key": "^2.0.0"
           }
         },
         "number-is-nan": {
@@ -7457,9 +7500,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "copy-descriptor": "0.1.1",
-            "define-property": "0.2.5",
-            "kind-of": "3.2.2"
+            "copy-descriptor": "^0.1.0",
+            "define-property": "^0.2.5",
+            "kind-of": "^3.0.3"
           },
           "dependencies": {
             "define-property": {
@@ -7467,7 +7510,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             }
           }
@@ -7477,7 +7520,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "isobject": "3.0.1"
+            "isobject": "^3.0.0"
           }
         },
         "object.pick": {
@@ -7485,7 +7528,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "isobject": "3.0.1"
+            "isobject": "^3.0.1"
           }
         },
         "once": {
@@ -7493,7 +7536,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "wrappy": "1.0.2"
+            "wrappy": "1"
           }
         },
         "optimist": {
@@ -7501,8 +7544,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "minimist": "0.0.8",
-            "wordwrap": "0.0.3"
+            "minimist": "~0.0.1",
+            "wordwrap": "~0.0.2"
           }
         },
         "os-homedir": {
@@ -7515,9 +7558,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "execa": "0.7.0",
-            "lcid": "1.0.0",
-            "mem": "1.1.0"
+            "execa": "^0.7.0",
+            "lcid": "^1.0.0",
+            "mem": "^1.1.0"
           }
         },
         "p-finally": {
@@ -7530,7 +7573,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-try": "1.0.0"
+            "p-try": "^1.0.0"
           }
         },
         "p-locate": {
@@ -7538,7 +7581,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-limit": "1.2.0"
+            "p-limit": "^1.1.0"
           }
         },
         "p-try": {
@@ -7551,7 +7594,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "error-ex": "1.3.1"
+            "error-ex": "^1.2.0"
           }
         },
         "pascalcase": {
@@ -7564,7 +7607,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "pinkie-promise": "2.0.1"
+            "pinkie-promise": "^2.0.0"
           }
         },
         "path-is-absolute": {
@@ -7587,9 +7630,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1"
+            "graceful-fs": "^4.1.2",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0"
           }
         },
         "pify": {
@@ -7607,7 +7650,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "pinkie": "2.0.4"
+            "pinkie": "^2.0.0"
           }
         },
         "pkg-dir": {
@@ -7615,7 +7658,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "find-up": "1.1.2"
+            "find-up": "^1.0.0"
           },
           "dependencies": {
             "find-up": {
@@ -7623,8 +7666,8 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "path-exists": "2.1.0",
-                "pinkie-promise": "2.0.1"
+                "path-exists": "^2.0.0",
+                "pinkie-promise": "^2.0.0"
               }
             }
           }
@@ -7644,9 +7687,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "load-json-file": "1.1.0",
-            "normalize-package-data": "2.4.0",
-            "path-type": "1.1.0"
+            "load-json-file": "^1.0.0",
+            "normalize-package-data": "^2.3.2",
+            "path-type": "^1.0.0"
           }
         },
         "read-pkg-up": {
@@ -7654,8 +7697,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "find-up": "1.1.2",
-            "read-pkg": "1.1.0"
+            "find-up": "^1.0.0",
+            "read-pkg": "^1.0.0"
           },
           "dependencies": {
             "find-up": {
@@ -7663,8 +7706,8 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "path-exists": "2.1.0",
-                "pinkie-promise": "2.0.1"
+                "path-exists": "^2.0.0",
+                "pinkie-promise": "^2.0.0"
               }
             }
           }
@@ -7674,8 +7717,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "3.0.2",
-            "safe-regex": "1.1.0"
+            "extend-shallow": "^3.0.2",
+            "safe-regex": "^1.1.0"
           }
         },
         "repeat-element": {
@@ -7719,7 +7762,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "align-text": "0.1.4"
+            "align-text": "^0.1.1"
           }
         },
         "rimraf": {
@@ -7727,7 +7770,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "glob": "7.1.2"
+            "glob": "^7.0.5"
           }
         },
         "safe-regex": {
@@ -7735,7 +7778,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "ret": "0.1.15"
+            "ret": "~0.1.10"
           }
         },
         "semver": {
@@ -7753,10 +7796,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "2.0.1",
-            "is-extendable": "0.1.1",
-            "is-plain-object": "2.0.4",
-            "split-string": "3.1.0"
+            "extend-shallow": "^2.0.1",
+            "is-extendable": "^0.1.1",
+            "is-plain-object": "^2.0.3",
+            "split-string": "^3.0.1"
           },
           "dependencies": {
             "extend-shallow": {
@@ -7764,7 +7807,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -7774,7 +7817,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "shebang-regex": "1.0.0"
+            "shebang-regex": "^1.0.0"
           }
         },
         "shebang-regex": {
@@ -7797,14 +7840,14 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "base": "0.11.2",
-            "debug": "2.6.9",
-            "define-property": "0.2.5",
-            "extend-shallow": "2.0.1",
-            "map-cache": "0.2.2",
-            "source-map": "0.5.7",
-            "source-map-resolve": "0.5.2",
-            "use": "3.1.0"
+            "base": "^0.11.1",
+            "debug": "^2.2.0",
+            "define-property": "^0.2.5",
+            "extend-shallow": "^2.0.1",
+            "map-cache": "^0.2.2",
+            "source-map": "^0.5.6",
+            "source-map-resolve": "^0.5.0",
+            "use": "^3.1.0"
           },
           "dependencies": {
             "debug": {
@@ -7820,7 +7863,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             },
             "extend-shallow": {
@@ -7828,7 +7871,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -7838,9 +7881,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "define-property": "1.0.0",
-            "isobject": "3.0.1",
-            "snapdragon-util": "3.0.1"
+            "define-property": "^1.0.0",
+            "isobject": "^3.0.0",
+            "snapdragon-util": "^3.0.1"
           },
           "dependencies": {
             "define-property": {
@@ -7848,7 +7891,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "1.0.2"
+                "is-descriptor": "^1.0.0"
               }
             },
             "is-accessor-descriptor": {
@@ -7856,7 +7899,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-data-descriptor": {
@@ -7864,7 +7907,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-descriptor": {
@@ -7872,9 +7915,9 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-accessor-descriptor": "1.0.0",
-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
               }
             },
             "kind-of": {
@@ -7889,7 +7932,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "kind-of": "3.2.2"
+            "kind-of": "^3.2.0"
           }
         },
         "source-map": {
@@ -7902,11 +7945,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "atob": "2.1.1",
-            "decode-uri-component": "0.2.0",
-            "resolve-url": "0.2.1",
-            "source-map-url": "0.4.0",
-            "urix": "0.1.0"
+            "atob": "^2.1.1",
+            "decode-uri-component": "^0.2.0",
+            "resolve-url": "^0.2.1",
+            "source-map-url": "^0.4.0",
+            "urix": "^0.1.0"
           }
         },
         "source-map-url": {
@@ -7919,12 +7962,12 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "foreground-child": "1.5.6",
-            "mkdirp": "0.5.1",
-            "os-homedir": "1.0.2",
-            "rimraf": "2.6.2",
-            "signal-exit": "3.0.2",
-            "which": "1.3.1"
+            "foreground-child": "^1.5.6",
+            "mkdirp": "^0.5.0",
+            "os-homedir": "^1.0.1",
+            "rimraf": "^2.6.2",
+            "signal-exit": "^3.0.2",
+            "which": "^1.3.0"
           }
         },
         "spdx-correct": {
@@ -7932,8 +7975,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-expression-parse": "3.0.0",
-            "spdx-license-ids": "3.0.0"
+            "spdx-expression-parse": "^3.0.0",
+            "spdx-license-ids": "^3.0.0"
           }
         },
         "spdx-exceptions": {
@@ -7946,8 +7989,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-exceptions": "2.1.0",
-            "spdx-license-ids": "3.0.0"
+            "spdx-exceptions": "^2.1.0",
+            "spdx-license-ids": "^3.0.0"
           }
         },
         "spdx-license-ids": {
@@ -7960,7 +8003,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "3.0.2"
+            "extend-shallow": "^3.0.0"
           }
         },
         "static-extend": {
@@ -7968,8 +8011,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "define-property": "0.2.5",
-            "object-copy": "0.1.0"
+            "define-property": "^0.2.5",
+            "object-copy": "^0.1.0"
           },
           "dependencies": {
             "define-property": {
@@ -7977,7 +8020,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             }
           }
@@ -7987,8 +8030,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-fullwidth-code-point": "2.0.0",
-            "strip-ansi": "4.0.0"
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
           }
         },
         "strip-ansi": {
@@ -7996,7 +8039,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "ansi-regex": "3.0.0"
+            "ansi-regex": "^3.0.0"
           }
         },
         "strip-bom": {
@@ -8004,7 +8047,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-utf8": "0.2.1"
+            "is-utf8": "^0.2.0"
           }
         },
         "strip-eof": {
@@ -8017,11 +8060,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arrify": "1.0.1",
-            "micromatch": "3.1.10",
-            "object-assign": "4.1.1",
-            "read-pkg-up": "1.0.1",
-            "require-main-filename": "1.0.1"
+            "arrify": "^1.0.1",
+            "micromatch": "^3.1.8",
+            "object-assign": "^4.1.0",
+            "read-pkg-up": "^1.0.1",
+            "require-main-filename": "^1.0.1"
           }
         },
         "to-object-path": {
@@ -8029,7 +8072,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "kind-of": "3.2.2"
+            "kind-of": "^3.0.2"
           }
         },
         "to-regex": {
@@ -8037,10 +8080,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "define-property": "2.0.2",
-            "extend-shallow": "3.0.2",
-            "regex-not": "1.0.2",
-            "safe-regex": "1.1.0"
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "regex-not": "^1.0.2",
+            "safe-regex": "^1.1.0"
           }
         },
         "to-regex-range": {
@@ -8048,8 +8091,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-number": "3.0.0",
-            "repeat-string": "1.6.1"
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1"
           }
         },
         "uglify-js": {
@@ -8058,9 +8101,9 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "source-map": "0.5.7",
-            "uglify-to-browserify": "1.0.2",
-            "yargs": "3.10.0"
+            "source-map": "~0.5.1",
+            "uglify-to-browserify": "~1.0.0",
+            "yargs": "~3.10.0"
           },
           "dependencies": {
             "yargs": {
@@ -8069,9 +8112,9 @@
               "dev": true,
               "optional": true,
               "requires": {
-                "camelcase": "1.2.1",
-                "cliui": "2.1.0",
-                "decamelize": "1.2.0",
+                "camelcase": "^1.0.2",
+                "cliui": "^2.1.0",
+                "decamelize": "^1.0.0",
                 "window-size": "0.1.0"
               }
             }
@@ -8088,10 +8131,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arr-union": "3.1.0",
-            "get-value": "2.0.6",
-            "is-extendable": "0.1.1",
-            "set-value": "0.4.3"
+            "arr-union": "^3.1.0",
+            "get-value": "^2.0.6",
+            "is-extendable": "^0.1.1",
+            "set-value": "^0.4.3"
           },
           "dependencies": {
             "extend-shallow": {
@@ -8099,7 +8142,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             },
             "set-value": {
@@ -8107,10 +8150,10 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "extend-shallow": "2.0.1",
-                "is-extendable": "0.1.1",
-                "is-plain-object": "2.0.4",
-                "to-object-path": "0.3.0"
+                "extend-shallow": "^2.0.1",
+                "is-extendable": "^0.1.1",
+                "is-plain-object": "^2.0.1",
+                "to-object-path": "^0.3.0"
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@@ -8120,8 +8163,8 @@
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-            "has-value": "0.3.1",
-            "isobject": "3.0.1"
+            "has-value": "^0.3.1",
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@@ -8129,9 +8172,9 @@
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-                "has-values": "0.1.4",
-                "isobject": "2.1.0"
+                "get-value": "^2.0.3",
+                "has-values": "^0.1.4",
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@@ -8161,7 +8204,7 @@
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+            "kind-of": "^6.0.2"
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@@ -8176,8 +8219,8 @@
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-            "spdx-correct": "3.0.0",
-            "spdx-expression-parse": "3.0.0"
+            "spdx-correct": "^3.0.0",
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@@ -8185,7 +8228,7 @@
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+            "isexe": "^2.0.0"
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@@ -8209,8 +8252,8 @@
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-            "strip-ansi": "3.0.1"
+            "string-width": "^1.0.1",
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@@ -8223,7 +8266,7 @@
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-                "number-is-nan": "1.0.1"
+                "number-is-nan": "^1.0.0"
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@@ -8231,9 +8274,9 @@
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-                "is-fullwidth-code-point": "1.0.0",
-                "strip-ansi": "3.0.1"
+                "code-point-at": "^1.0.0",
+                "is-fullwidth-code-point": "^1.0.0",
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@@ -8241,7 +8284,7 @@
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-                "ansi-regex": "2.1.1"
+                "ansi-regex": "^2.0.0"
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@@ -8256,9 +8299,9 @@
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-            "imurmurhash": "0.1.4",
-            "slide": "1.1.6"
+            "graceful-fs": "^4.1.11",
+            "imurmurhash": "^0.1.4",
+            "slide": "^1.1.5"
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@@ -8276,18 +8319,18 @@
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-            "which-module": "2.0.0",
-            "y18n": "3.2.1",
-            "yargs-parser": "9.0.2"
+            "cliui": "^4.0.0",
+            "decamelize": "^1.1.1",
+            "find-up": "^2.1.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^2.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1",
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@@ -8300,9 +8343,9 @@
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-                "string-width": "2.1.1",
-                "strip-ansi": "4.0.0",
-                "wrap-ansi": "2.1.0"
+                "string-width": "^2.1.1",
+                "strip-ansi": "^4.0.0",
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@@ -8310,7 +8353,7 @@
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               "dev": true,
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-                "camelcase": "4.1.0"
+                "camelcase": "^4.1.0"
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@@ -8320,7 +8363,7 @@
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+            "camelcase": "^4.1.0"
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@@ -8356,9 +8399,9 @@
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-        "define-property": "0.2.5",
-        "kind-of": "3.2.2"
+        "copy-descriptor": "^0.1.0",
+        "define-property": "^0.2.5",
+        "kind-of": "^3.0.3"
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@@ -8367,7 +8410,7 @@
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           "dev": true,
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-            "is-descriptor": "0.1.6"
+            "is-descriptor": "^0.1.0"
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@@ -8384,7 +8427,7 @@
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@@ -8401,8 +8444,8 @@
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       "dev": true,
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-        "for-own": "0.1.5",
-        "is-extendable": "0.1.1"
+        "for-own": "^0.1.4",
+        "is-extendable": "^0.1.1"
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@@ -8411,7 +8454,7 @@
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       "dev": true,
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+        "isobject": "^3.0.1"
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@@ -8437,7 +8480,7 @@
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       "dev": true,
       "requires": {
-        "wrappy": "1.0.2"
+        "wrappy": "1"
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@@ -8446,7 +8489,7 @@
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       "dev": true,
       "requires": {
-        "mimic-fn": "1.2.0"
+        "mimic-fn": "^1.0.0"
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@@ -8455,8 +8498,8 @@
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       "dev": true,
       "requires": {
-        "minimist": "0.0.8",
-        "wordwrap": "0.0.3"
+        "minimist": "~0.0.1",
+        "wordwrap": "~0.0.2"
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@@ -8465,12 +8508,12 @@
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-        "fast-levenshtein": "2.0.6",
-        "levn": "0.3.0",
-        "prelude-ls": "1.1.2",
-        "type-check": "0.3.2",
-        "wordwrap": "1.0.0"
+        "deep-is": "~0.1.3",
+        "fast-levenshtein": "~2.0.4",
+        "levn": "~0.3.0",
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2",
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@@ -8499,7 +8542,7 @@
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       "dev": true,
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-        "p-try": "1.0.0"
+        "p-try": "^1.0.0"
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@@ -8508,7 +8551,7 @@
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       "dev": true,
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-        "p-limit": "1.3.0"
+        "p-limit": "^1.1.0"
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@@ -8524,14 +8567,14 @@
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-        "http-proxy-agent": "2.1.0",
-        "https-proxy-agent": "2.2.1",
-        "pac-resolver": "3.0.0",
-        "raw-body": "2.3.3",
-        "socks-proxy-agent": "3.0.1"
+        "agent-base": "^4.2.0",
+        "debug": "^3.1.0",
+        "get-uri": "^2.0.0",
+        "http-proxy-agent": "^2.1.0",
+        "https-proxy-agent": "^2.2.1",
+        "pac-resolver": "^3.0.0",
+        "raw-body": "^2.2.0",
+        "socks-proxy-agent": "^3.0.0"
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@@ -8553,11 +8596,11 @@
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-        "degenerator": "1.0.4",
-        "ip": "1.1.5",
-        "netmask": "1.0.6",
-        "thunkify": "2.1.2"
+        "co": "^4.6.0",
+        "degenerator": "^1.0.4",
+        "ip": "^1.1.5",
+        "netmask": "^1.0.6",
+        "thunkify": "^2.1.2"
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@@ -8566,10 +8609,10 @@
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-        "is-dotfile": "1.0.3",
-        "is-extglob": "1.0.0",
-        "is-glob": "2.0.1"
+        "glob-base": "^0.3.0",
+        "is-dotfile": "^1.0.0",
+        "is-extglob": "^1.0.0",
+        "is-glob": "^2.0.0"
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@@ -8578,7 +8621,7 @@
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       "dev": true,
       "requires": {
-        "error-ex": "1.3.1"
+        "error-ex": "^1.2.0"
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@@ -8587,7 +8630,7 @@
       "integrity": "sha1-1SCKNzjkZ2bikbouoXNoSSGouJ0=",
       "dev": true,
       "requires": {
-        "better-assert": "1.0.2"
+        "better-assert": "~1.0.0"
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@@ -8596,7 +8639,7 @@
       "integrity": "sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=",
       "dev": true,
       "requires": {
-        "better-assert": "1.0.2"
+        "better-assert": "~1.0.0"
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@@ -8623,7 +8666,7 @@
       "integrity": "sha1-D+tsZPD8UY2adU3V77YscCJ2H0s=",
       "dev": true,
       "requires": {
-        "pinkie-promise": "2.0.1"
+        "pinkie-promise": "^2.0.0"
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@@ -8651,7 +8694,7 @@
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+        "inflection": "~1.3.0"
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@@ -8669,9 +8712,9 @@
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       "dev": true,
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-        "graceful-fs": "4.1.11",
-        "pify": "2.3.0",
-        "pinkie-promise": "2.0.1"
+        "graceful-fs": "^4.1.2",
+        "pify": "^2.0.0",
+        "pinkie-promise": "^2.0.0"
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@@ -8704,7 +8747,7 @@
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       "dev": true,
       "requires": {
-        "pinkie": "2.0.4"
+        "pinkie": "^2.0.0"
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@@ -8713,8 +8756,8 @@
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       "dev": true,
       "requires": {
-        "find-up": "2.1.0",
-        "load-json-file": "4.0.0"
+        "find-up": "^2.0.0",
+        "load-json-file": "^4.0.0"
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@@ -8723,7 +8766,7 @@
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           "dev": true,
           "requires": {
-            "locate-path": "2.0.0"
+            "locate-path": "^2.0.0"
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@@ -8732,10 +8775,10 @@
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           "dev": true,
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-            "parse-json": "4.0.0",
-            "pify": "3.0.0",
-            "strip-bom": "3.0.0"
+            "graceful-fs": "^4.1.2",
+            "parse-json": "^4.0.0",
+            "pify": "^3.0.0",
+            "strip-bom": "^3.0.0"
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@@ -8744,8 +8787,8 @@
           "integrity": "sha1-vjX1Qlvh9/bHRxhPmKeIy5lHfuA=",
           "dev": true,
           "requires": {
-            "error-ex": "1.3.1",
-            "json-parse-better-errors": "1.0.2"
+            "error-ex": "^1.3.1",
+            "json-parse-better-errors": "^1.0.1"
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@@ -8768,9 +8811,9 @@
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       "dev": true,
       "requires": {
-        "debug-log": "1.0.1",
-        "find-root": "1.1.0",
-        "xtend": "4.0.1"
+        "debug-log": "^1.0.0",
+        "find-root": "^1.0.0",
+        "xtend": "^4.0.1"
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@@ -8779,7 +8822,7 @@
       "integrity": "sha1-ektQio1bstYp1EcFb/TpyTFM89Q=",
       "dev": true,
       "requires": {
-        "find-up": "1.1.2"
+        "find-up": "^1.0.0"
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@@ -8800,7 +8843,7 @@
       "integrity": "sha1-Kip5gn0kOnbJEImJescH9F5xaqw=",
       "dev": true,
       "requires": {
-        "shelljs": "0.3.0"
+        "shelljs": "0.3.x"
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@@ -8845,7 +8888,7 @@
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       "dev": true,
       "requires": {
-        "asap": "2.0.6"
+        "asap": "~2.0.3"
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@@ -8855,7 +8898,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "with-callback": "1.0.2"
+        "with-callback": "^1.0.2"
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@@ -8864,9 +8907,9 @@
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       "requires": {
-        "fbjs": "0.8.16",
-        "loose-envify": "1.3.1",
-        "object-assign": "4.1.1"
+        "fbjs": "^0.8.16",
+        "loose-envify": "^1.3.1",
+        "object-assign": "^4.1.1"
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@@ -8884,14 +8927,14 @@
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-        "lru-cache": "4.1.3",
-        "pac-proxy-agent": "2.0.2",
-        "proxy-from-env": "1.0.0",
-        "socks-proxy-agent": "3.0.1"
+        "agent-base": "^4.2.0",
+        "debug": "^3.1.0",
+        "http-proxy-agent": "^2.1.0",
+        "https-proxy-agent": "^2.2.1",
+        "lru-cache": "^4.1.2",
+        "pac-proxy-agent": "^2.0.1",
+        "proxy-from-env": "^1.0.0",
+        "socks-proxy-agent": "^3.0.0"
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@@ -8943,9 +8986,9 @@
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       "dev": true,
       "requires": {
-        "is-number": "4.0.0",
-        "kind-of": "6.0.2",
-        "math-random": "1.0.1"
+        "is-number": "^4.0.0",
+        "kind-of": "^6.0.0",
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@@ -8986,9 +9029,9 @@
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-        "load-json-file": "1.1.0",
-        "normalize-package-data": "2.4.0",
-        "path-type": "1.1.0"
+        "load-json-file": "^1.0.0",
+        "normalize-package-data": "^2.3.2",
+        "path-type": "^1.0.0"
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@@ -8997,8 +9040,8 @@
       "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
       "dev": true,
       "requires": {
-        "find-up": "1.1.2",
-        "read-pkg": "1.1.0"
+        "find-up": "^1.0.0",
+        "read-pkg": "^1.0.0"
       }
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@@ -9007,13 +9050,13 @@
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       "dev": true,
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-        "inherits": "2.0.3",
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-        "safe-buffer": "5.1.2",
-        "string_decoder": "1.1.1",
-        "util-deprecate": "1.0.2"
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
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@@ -9022,10 +9065,10 @@
       "integrity": "sha1-TtCtBg3zBzMAxIRANz9y0cxkLXg=",
       "dev": true,
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-        "minimatch": "3.0.4",
-        "readable-stream": "2.3.6",
-        "set-immediate-shim": "1.0.1"
+        "graceful-fs": "^4.1.2",
+        "minimatch": "^3.0.2",
+        "readable-stream": "^2.0.2",
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@@ -9034,8 +9077,8 @@
       "integrity": "sha1-z5Fqsf1fHxbfsggi3W7H9zDCr94=",
       "dev": true,
       "requires": {
-        "indent-string": "2.1.0",
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         "kind-of": {
@@ -10519,8 +10566,8 @@
       "integrity": "sha1-z1k+9PLRdYdei7ZY6pLhik/QbY4=",
       "dev": true,
       "requires": {
-        "lru-cache": "2.2.4",
-        "tmp": "0.0.33"
+        "lru-cache": "2.2.x",
+        "tmp": "0.0.x"
       },
       "dependencies": {
         "lru-cache": {
@@ -10562,8 +10609,8 @@
       "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
       "dev": true,
       "requires": {
-        "spdx-correct": "3.0.0",
-        "spdx-expression-parse": "3.0.0"
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
       }
     },
     "verror": {
@@ -10572,9 +10619,9 @@
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
       "requires": {
-        "assert-plus": "1.0.0",
+        "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
-        "extsprintf": "1.3.0"
+        "extsprintf": "^1.2.0"
       }
     },
     "vlq": {
@@ -10608,7 +10655,7 @@
       "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "window-size": {
@@ -10643,7 +10690,7 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "ws": {
@@ -10652,9 +10699,9 @@
       "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
       "dev": true,
       "requires": {
-        "async-limiter": "1.0.0",
-        "safe-buffer": "5.1.2",
-        "ultron": "1.1.1"
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
       }
     },
     "xmlhttprequest-ssl": {
@@ -10689,9 +10736,9 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
         "window-size": "0.1.0"
       },
       "dependencies": {
diff --git a/src/observer.js b/src/observer.js
index d7767d7..61d5ad9 100644
--- a/src/observer.js
+++ b/src/observer.js
@@ -13,6 +13,7 @@ export function observe (fn, options = {}) {
   // save the scheduler and debugger on the reaction
   reaction.scheduler = options.scheduler
   reaction.debugger = options.debugger
+  reaction.failOnRecursion = options.failOnRecursion
   // save the fact that this is a reaction
   reaction[IS_REACTION] = true
   // run the reaction once if it is not a lazy one
diff --git a/src/reactionRunner.js b/src/reactionRunner.js
index b880210..a5905cc 100644
--- a/src/reactionRunner.js
+++ b/src/reactionRunner.js
@@ -30,6 +30,10 @@ export function runAsReaction (reaction, fn, context, args) {
       // always remove the currently running flag from the reaction when it stops execution
       reactionStack.pop()
     }
+  } else {
+    if (reaction.failOnRecursion) {
+      throw new Error('Recursive reactions are not allowed');
+    }
   }
 }
 
diff --git a/tests/observe.test.js b/tests/observe.test.js
index 28a36c8..ca39318 100644
--- a/tests/observe.test.js
+++ b/tests/observe.test.js
@@ -353,6 +353,27 @@ describe('observe', () => {
     expect(spy2.callCount).to.equal(3)
   })
 
+  it('should throw on recursion if instructed', () => {
+    const counter = observable({ num: 0 })
+
+    // TODO: supporting recursion would obviate
+    // the need for this feature
+    const numSpy = spy(() => {
+      counter.num++
+    })
+
+    let threw = false;
+    try {
+      observe(numSpy, { failOnRecursion: true })
+    } catch (ex) {
+	threw = true;
+    }
+
+    expect(counter.num).to.equal(1)
+    expect(numSpy.callCount).to.equal(0)
+    expect(threw).to.equal(true)
+  });
+
   it('should return a new reactive version of the function', () => {
     function greet () {
       return 'Hello World'
diff --git a/types/index.d.ts b/types/index.d.ts
index df1a587..ff6a9c5 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -12,6 +12,7 @@ declare module '@nx-js/observer-util' {
     scheduler?: Scheduler | Function
     debugger?: Function
     lazy?: boolean
+    failOnRecursion?: boolean
   }
 
   function observe<Reaction extends Function>(func: Reaction, options?: ObserveOptions): Reaction