Switching over to abstracted data provider meant that email_address
accidentally got passed to the model as email and therefore could not
be found. This is now resolved.
Also, added trailing slash to register route, which I believe should be there
There is now a login page. Trying to access any authenticated route will redirect you to a login page if you are not logged in.
Logging in works with the same hard-coded username and password & remembers you for a session.
Logging in will redirect you to your original route.
Flashes are present although they don't really appear in the right place.
