Statistics fixes
Merge branch 'master' of https://github.com/Vladimiroff/massive-octo-ninja
Merge branch 'master' of https://github.com/Vladimiroff/massive-octo-ninja
Add grade comment ant rating
Merge branch 'master' of https://github.com/Vladimiroff/massive-octo-ninja

Conflicts:
	mon/courses/views.py