Implemented EventDispatcher in Ticker.
Implemented EventDispatcher in Ticker.

Signed-off-by: Grant Skinner <59bd0a3ff43b32849b319e645d4798d8a5d1e889@gskinner.com>

mientjan/weasel,mientjan/weasel,mientjan/EaselTS,createjs-components/easeljs,markknol/EaselTS,SpringRoll/EaselJS,markknol/EaselTS,mientjan/EaselTS,markknol/EaselTS,SpringRoll/EaselJS