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 34311: Version 0.9.0.0
- Finished tested User Controller
- Updated testes for the FriendshipQueryController
- Added default parameter values for some of the user controller methods