Fixed LogIn module name
Created UnregisteredUser entity and TrelloLogIn view
Implemented creating new UnregisteredUser and showing TrelloLogIn view
Implemented registering unregistered user
Fixed creating Users and UnregisteredUsers
User Email is now unique
Started implementing obtaining Trello access token
Improved Trello access retrieval
Added TrelloLogInResultModel validation
Merge branch 'trello_authorization'