Merge pull request #222 from dirkcuys/master

Support for cloning courses and exporting course signups
Rename EMBED_API_ENDPOINT to BADGES_OEMBED_URL
Move badges oembed code to separate file
Merge branch 'master' of github.com:p2pu/lernanta
Pin git requirements to avoid surprises
Revert to django-push from paulosman github repo
Pin html5lib requirement
Redirect from the old notification preferences to the new notification preferences.
Update URL for notification preferences
fix indentation for urls
Update test to test for cloning about content
Move BadgeNotFoundException
Clone course about content