Legacy: Clear video sources when leaving section
- restore source urls when activate
- source url stored entirely in JS
- restore last currentTime on activate
- misc related code clean-up
Periphery: Clear video sources when leaving section
- restore source urls when activate
- source url stored entirely in JS
- restore last currentTime on activate
- misc related code clean-up
Fix and clean up video source clearing for Cradle
Merge pull request #186 from brianchirls/veev

Clear video sources for Cradle, Periphery and Legacy