* fix(models.user): Colocate all user methods
Moved user methods/extensions into one file. Tracked down `next method
called more than once` error and setting headers after their sent. Let
regular error handler handle api errors as well.
* feat(server.auth): Disable github account creation
We are no longer allowing account creation through github
* refactor(Auth): Move user identity link into models dir
* feat(Disable link account login): This removes the ability to use a linked account t
* feat(errorhandlers): Add opbeat, filter out handled error
