Delete the user_profile app
Remove auth related styling
Remove login links from pages
misc changes to CSS (probaly due to sass version differences)
Get rid of registration apps
Remove redundant facebook cruft
Remove twitter cruft
Strip out social_auth
Remove redundant tests
Further deletions
Selenium test fix (to get tests running, not passing yet)
Delete social_auth data from the database
Remove login link from mobile header
Delete from ContentType in a separate transaction
Delete entries from the South migration history too
Migration to clean out the registration app
Change how the app removal migrations work to cope with South 0.8 (which catches the DatabaseError exceptions we used to catch)