Recreate migration with Django 1.7 final and re-PEP8.

This seems to work around a false-positive migration being created
even if nothing has actually changed.

A similar problem occurred in easy-thumbnails: https://github.com/SmileyChris/easy-thumbnails/commit/b95e6888cd7bea9c5138b72bdbcd1e743655580f
Merge branch 'django-1.7-migration' of github.com:kcsry/python-social-auth into kcsry-django-1.7-migration
PEP8
Merge branch 'kcsry-django-1.7-migration'