Update angular version to 1.2.0

Discussed in #405
AngularJS 1.2.0 is stable as of [today](http://blog.angularjs.org/2013/11/angularjs-120-timely-delivery.html).

Major changes:
* `ngRoute` is a separate module which is required by the app. For that reason I included it by default.

I've been considering on adding angular-animate as an option in the prompt. Thoughs on this?