Merge pull request #2750 from learningequality/nalanda-rct3

Nalanda rct3 to nalanda
Merge pull request #2782 from anuragkanungo/nalanda-rct3

#2593: Exercise Log CSV Part 1 and 2 Attempt Correct added
Merge branch 'nalanda' of github.com:learningequality/ka-lite into nalanda-rct3
Upgrade django-south from 0.7.6 to 0.8.4 (to support index_together)
Removed cell-content class which was giving dot ellipsis in viewing the playlist on homepage and  assigned playlistd table width increased to 100%