added a few TODOs ...
completed clip "preemptive" start logic
HACK: minize slowdown between clips by actually not stop a clip
Merge branch 'master' of https://github.com/jcbatista/KinectSilhouetteVideoOverlay into dev-prestart
set black background for full screen mode
Merge branch 'master' of https://github.com/jcbatista/KinectSilhouetteVideoOverlay into dev-transition
decoupled the timeline from the ActionClipManager
the timeline duration is now the sum of all the durations for all the clips
reset timeline when playback starts