[CYB-95] - Added Percentile column with sorting, removed Rank
[CYB-95] -- A big commit: Added percentile, removed rank, added instructor view, added highlighting, share/not share views via the landing page are now working properly
Working on initializers test, need to implement Jason's code
[CYB-95] -- Fixed minor backend code
Merge pull request #36 from richcreationsrc/engagement-index-percentile

Engagement Index Percentile
Merge branch 'master' of https://github.com/ets-berkeley-edu/datacultures into CYB-93
Written Initializer Spec Tests