* Switch from auth.loginUser to User.loginPasswordUser with Promise
* Remove a cascade of unused views that were using auth.loginUser: StudentLogInModal, StudentSignupModal, HourOfCodeView
* Also remove auth.createUser
* Take `/server/routes/auth` and move most of the logic to `/server/middleware/auth`, refactoring to use generators.
* List all `/auth/*` endpoints in `/server/routes/index.coffee`.
* Fill in testing gaps for `/auth/unsubscribe`.
* Add debug log when `sendwithus` is not operational, so it 'works' in development and testing.
* Use passport properly!
* Track Facebook and G+ logins in user activity as well as passport logins.
