Fixed dependency between unit tests. Fake repository wasn't being cleaning properly. Now each test fixture has it's own tear down method to clear repository.

Repository now returns all users, not only active, because such filtering appears in searchByRoleAndState().
Fixed integrational UserPagingTests tests.
Don't forget to change back connectionString in app settings when run these tests.
Fixed UsersControllerTest integrational tests. Set Db context to a real database, not the fake DB. Works fine and clears up everything after testing, but tests fall if initial db already contains records with emails used in tests.