Non-twitter login

[verschoof]

Since our application can only login with Twitter, we want a button that visitors can press to let us know If they have no twitter.

For Developers, being able to log in should not be connected to Twitter (they won't have our application codes) so a basic existing user could be added to the fixtures to allow a developer to log in without actual twitter login.

(this can then be extended to a production registration/login process without Twitter, but that is a separate issue)