Merge pull request #74 from susieye19/master

Update course syllabus
Merge pull request #75 from susieye19/master

Format preview account page
Clean up Mixpanel event tracking
Merge Susie's changes
Set up all tracking except for plan updates and paid conversions
Fix redirect_path error in Chapters controller
Add 'play' image to all video library videos
Delete Notes margin
Delete notes h4 margin
Change container width to auto
Change question response margin
Edit yelpdemo syllabus
Get rid of border-top
Add courses-show section
Update demo to yelpdemo
Allow existing users with coupons to enroll
Add debugging statements to chapters_controller
Test putting parentheses
Add more debugging
Change free preview account descripton