Methods to add questions and answers (question list is still fake)
Some missing things, improvements, etc.

Worth noting:
- ExceptionMapper to return JSON on API errors
- errorLoggingInterceptor to simplify $http calls (shows that JSON error)
Create questions and answers. Answer list shown in the view is fake.
De/serializer for ObjectId. By default Jackson doesn't de/serialize it well.
Return $http promises from FindTheBestApiService methods.