Merge pull request #33 from LI-HE/gh-pages

updated question progress status check and lock/unlock of videos
Added cohort analysis controller
dynamic selectquests.html
Merge pull request #34 from ruijunhuang2010/gh-pages

dynamic selectquests.html (data fetch from app-test.js)
Updating cohort analysis
Updated cohort analysis
updated practice.html

- carousel on large screen works
- radio buttons hidden
- default difficulty level set 
Merge pull request #2 from SMU-SIS/gh-pages

update