Remove log statement and useless redraw.
Fix #394: Optimise performance for adding or updating annotation in the list.
#394: Different updates. Limit the time ranges change for the timeline.
#394: The behaviour of the timeline can be set now, to follow or not the playhead.
#393 -- Implemented lazy loading for comments + others small fixes like issue related to track selection.
Update grunt file for build operation + some cleaning in the old files used with the ant build script.