Convert Video to new validation scheme
1. Give modal button an action
2. Convert ...Binding to use Em.computed.alias
3. Handle presentation urls that are incomplete
1. Add SoundCloud support
2. create separate pending template
Soundcloud working
Fix sequence sorting
Index page. CSS.
1. Allow resetting of video scrubbers
2. #skipTo plays or cues
3. index page, css
4. hint.css