chore(deps): update angular2 and zones versions

Author: kara

package.json

@@ -25,19 +25,20 @@
     "node": ">= 4.2.1 < 5"
   },
   "dependencies": {
-    "angular2": "2.0.0-beta.13",
+    "angular2": "2.0.0-beta.15",
     "es6-promise": "^3.0.2",
     "es6-shim": "^0.35.0",
     "reflect-metadata": "0.1.2",
     "rxjs": "5.0.0-beta.2",
     "systemjs": "0.19.20",
-    "zone.js": "0.6.6"
+    "zone.js": "0.6.10"
   },
   "devDependencies": {
     "add-stream": "^1.0.0",
     "angular-cli": "^0.0.31",
     "broccoli-autoprefixer": "^4.1.0",
     "broccoli-funnel": "^1.0.1",
+    "broccoli-merge-trees": "^1.1.1",
     "browserstacktunnel-wrapper": "^1.4.2",
     "conventional-changelog": "^1.1.0",
     "ember-cli-inject-live-reload": "^1.3.0",