return value fix for social.associate_user function.
Return None is better imho.
Merge pull request #633 from serdardalgic/return_value_fix_for_pipeline_social_associate_user_function

Return value fix for pipeline social associate user function
Update angel.rst

In the Angel List documentation it should read
ANGEL_AUTH_EXTRA_ARGUMENTS = {'scope': 'email message'}
not
ANGEL_AUTH_EXTRA_ARGUMENTS = {'scope': 'email messages'}
Merge pull request #635 from martmatwarne/master

Update to Angel List documentation
Add missing discard var. Closes #636
Merge branch 'master' of github.com:omab/django-social-auth
Style the use-cases section, move browserid doc to it's backend docs
Fix dailymotion backend