facebook button tag accepts an arbitrary number of context variables and strings that get concatenated to generate the button image source url
openid_form tag accepts an arbitrary number of context variables and strings that get concatenated to generate the button source url
Remove unique constaint as described in issue 163 of django-socialregistration.
Application does not crash with custom User model
Merge branch 'master' of github.com:flashingpumpkin/django-socialregistration

Conflicts:
	socialregistration/contrib/tumblr/models.py
Merge branch 'master' of github.com:flashingpumpkin/django-socialregistration
Merge branch 'master' of github.com:jimpurbrick/django-socialregistration
Merge branch 'master' of github.com:zalmoxis/django-socialregistration