Upgrade to Ember CLI 0.2.7

Author: Gaurav0

package.json

@@ -20,7 +20,7 @@
   "license": "MIT",
   "devDependencies": {
     "broccoli-asset-rev": "^2.0.2",
-    "ember-cli": "ember-cli/ember-cli#f444a1a631631af0cf9f97d915596b915cc845a5",
+    "ember-cli": "0.2.7",
     "ember-cli-app-version": "0.3.3",
     "ember-cli-content-security-policy": "0.4.0",
     "ember-cli-dependency-checker": "^1.0.0",