Removed Twitter as auth provider (#612)

Author: harriebird

djangosnippets/settings/base.py

@@ -60,7 +60,6 @@ def user_url(user):
     "allauth.socialaccount",
     "allauth.socialaccount.providers.bitbucket_oauth2",
     "allauth.socialaccount.providers.github",
-    "allauth.socialaccount.providers.twitter",
     "base",
     "cab",
     "comments_spamfighter",