use original node zlib.js; add build system

Now src/index.js is the same as node core zlib.js, with only two
requires changed. Because that uses ES6 syntax, babel is needed.

Author: jscissr

.gitignore

@@ -4,3 +4,4 @@ node_modules
 *.log
 
 test/tmp
+lib

.npmignore

@@ -0,0 +1,6 @@
+node_modules
+.DS_Store
+
+*.log
+
+test/tmp

package.json

@@ -6,14 +6,16 @@
     "zlib",
     "browserify"
   ],
-  "main": "src/index.js",
+  "main": "lib/index.js",
   "directories": {
     "test": "test"
   },
   "dependencies": {
     "pako": "~1.0.1"
   },
   "devDependencies": {
+    "babel-cli": "^6.11.4",
+    "babel-preset-es2015": "^6.13.2",
     "brfs": "^1.0.1",
     "karma": "^1.1.0",
     "karma-browserify": "^5.0.3",
@@ -28,11 +30,18 @@
     "watchify": "^3.7.0"
   },
   "scripts": {
-    "lint": "standard",
+    "build": "babel src --out-dir lib",
+    "lint": "standard \"src/binding.js\" \"test/**/*.js\"",
+    "pretest": "npm run build",
     "test": "npm run test:node && npm run test:browser",
     "test:browser": "karma start --single-run=true karma.conf.js",
     "test:node": "mocha test/test-*"
   },
+  "babel": {
+    "presets": [
+      "es2015"
+    ]
+  },
   "author": "Devon Govett <[email protected]>",
   "license": "MIT",
   "repository": {