Email case-insensitive when asking for passedcourses
Freeze the django version in the setup.py
Bugfix related to the evaluation criteria of P2P

The modal popup that showed the evaluation criteria of the P2P
activities in the progress view had a bug, the criteria wasn't
loaded properly and was badly assigned to the P2P activities.
Bugfix in api related to certification
Bugfix YouTube + Internet Explorer
Improve YouTube integration
Add a copy of MathJax so OpenMOOC doesn't depend on external resources
Merge branch 'master' into feature-assets