fix(build): npm install angular-moment fails. close #121

Author: urish

CONTRIBUTING.md

@@ -25,7 +25,12 @@ and install all needed dependencies via **npm**:
 
 `npm install`
 
-`angular-moment` is now installed and ready to be built.
+To complete the installation, install the frontend (bower) dependencies by running the 
+following command:
+
+`npm run bower`
+
+Well done! angular-moment is now installed and ready to be built.
 
 ## Building
 

package.json

@@ -28,8 +28,8 @@
     "node": ">=0.10.0"
   },
   "scripts": {
-    "postinstall": "bower install",
-    "test": "grunt test",
-    "build": "grunt build"
+    "bower": "node_modules/.bin/bower install",
+    "test": "node_modules/.bin/grunt test",
+    "build": "node_modules/.bin/grunt build"
   }
 }