prevent scrollbars in main viewport
Merge branch 'master' into ttb
added TTB module
TTB module can play video
jump to TTB after Intro video ends
switched to Backbone 0.9.9
added ability to jump to pint in time in TTB video -  issue #29
added simple play/pause mechanism
added restrictions to pause when outside of chapter
minor change
fixed 'pause not allowed' overlay position and behaviour
overlay position fix
added overlay management in video view
added ability to show next chapter to user with 'pause not allowed' behaviour
moved allowPlayPause behaviour to Video module
made video overlay+message work on iPad
fixed #35 by cleaning up after Video view removal

+ various refactoring that were needed
small adjustments