Added ngQuestionnaires

I've created this demo app using AngularJS v1.2.0-rc.3. It features

1. D3 for animated bar chart of question choice statistics
2. Firebase for persistence
3. FirebaseSimpleLogin authentication with GitHub, Facebook and Twitter providers
4. UI Router for routing
5. Supports CRUD operation with access controls
6. UI Bootstrap components

I thought it was worth adding because no other submissions seem to use Firebase, so it may be useful for others to learn from.