Update answer tab count on adding new answer.
Merge pull request #119 from stephenjust/username-fix

Restrict usernames to a single line.
Merge pull request #118 from stephenjust/answer-tab-fix

Update answer tab count on adding new answer.
Fixed bug when hitting back button on welcome screen
No longer need for onActivityResult
Can only enter welcome screen once!
Merge pull request #123 from CMPUT301F14T14/Sort

Fixed bug when hitting back button on welcome screen Issue #110
Create serializers and deserializers for model classes.

The default serializer for the question/comment/answer objects is almost perfect, but custom ones give more control.
In the case of deserialization, custom deserializers allow us to pack data into existing objects, which needs support
in DataManager.
Fix putting data to ES.