Use django-registration

[fhahn]

Use django-registration instead of dajngopeople.views.SignupView

[brutasse]

Not sure about this. django-registration is getting old and the CBVs give us a much nicer API.

I'm considering adding some registration capability to django-le-social, maybe we could use it for the whole registration process, with twitter / openid / traditional registration.

[fhahn]

Yep, I just thought we should discuss the whole signup/social auth stuff once we've finished migrating to class based views.