Small tweaks to be compatible with the Cinder app_rewrite branch.
Add start and stop to QTimelineModule.
Don't crash if there's no asset directory.
Keep track of active timeline item for each track.  Makes rendering by track order easier / quicker.
Base rendering order on track order.
Simplify the start/complete callbacks on the QTimelineModule class.  This also fixes the active timeline item bug that occured if you skipped over a module in reverse.
...
Merge branch 'app_rewrite_changes' of git://github.com/bzztbomb/QTimeline into bzztbomb-app_rewrite_changes
rename QTimelineModule activeChange() to stateChanged(). add QTimelineItem::isRunning()
...
Merge branch 'bzztbomb-app_rewrite_changes'

Conflicts:
	samples/BasicSample/xcode/BasicSample.xcodeproj/project.xcworkspace/xcuserdata/Q.xcuserdatad/UserInterfaceState.xcuserstate
move audio assets