issue #33: added to settings additional social auth permission user:email
Merge remote-tracking branch 'remotes/upstream/master' into issue-33-github-login
issue #33: added version of required django-social-auth app in the requirements.txt file
Merge branch 'master' into issue-33-github-login
Merge pull request #54 from trilliput/issue-33-github-login

Issue #33 fetch email during github login