Tests project setup
Updated solution file to include Tests project.
Added PAWAContext interface, updated PAWAContext to use interface.
Added TestDbContext for testing purposes and PAWAContext interface.
Updated DisplayImage class and view, and ImageController to use IPAWAContext
Added constructor to TestPAWAContext, added DisplayImageTests, which tests PAWA/Classes/DisplayImage.cs
Merge branch 'TestSolution'