-add_user modified to fit the idea of getting email at the backend

-google_auth now uses put to add users to database
Merge branch 'kuukkel-auth' of https://github.com/tttro/projektityokurssi into kuukkel-auth

Conflicts:
	backend/lbd_backend/LBD_REST_locationdata/views.py
	backend/lbd_backend/settings.py
	web/login-demo/google_auth.html
-DOMAIN/ now allows registering new users

-DOMAIN/user_exists for testing if a user exists
-Commented dbus import away as gave errors and wasn't used