Various

1.  Integration test environment now working
2.  Category Repository Integration tests complete.
3.  Final data annotations added to Subscriber.cs
4.  Final data annotations added to NewsLetter.cs
5.  Unit tests for Subscriber.cs complete.
6.  Skeleton Subscriber repository added.
7.  Fully implemented NewsLetter repository added.
8.  NewsLetter Rep injected into Admin controller and wired up via
Ninject