All tests refactored to NUnit - folder structure moved one level down to root

Nothing in code changed.

 * Moved everything down one folder level so the solution & projects are in the root instead of a directory.
 * Migrated over to NUnit since MSTest leaves hooks that won't build on anything except a Visual Studio installed system or TFS enabled build server.  :(  no more sad pandas!
 * Pluralized the test project to 'Tests' and removed 'Test' in subsequent commit.