Upgraded timeline and libraries

* Upgraded backbone and underscore
* Upgraded Marionette
* Fixing play/pause button
follow up
Upgrading track browser

* adding stack trace
 * upgrading track browser
 * refactoring router
Ignoring sass cache files
Implementing Jquery UI and volume slider

 * Adding jquery ui slider
 * Adding volume to page state model
 * converting timeline to jquery ui slider
Minor changes

 * Optimizing Build script