Commented Feature: Update : [code/unity] Migrate application design to use Unity for IoC [1691]

Implement Unity and Dependency injection to enable the development of Unit Tests as Tweetinvi currently only have Integration tests.
Comments: Associated with changeset 33302: Version 0.9.0.0
- Cleanup the UserController
- Extracted the UserQuery generation with the UserQueryGenerator
- Added missing features of the UserController to the static User class