removed deprecated List.fixedLength
fixed deprecated mouse clientX and clientY
code beautifications
fixed mouse wheel event
optimized ColorMatrixFilter with bit shifting

the recent changes to ~/ made it much slower.
optimized integer divisions with bit shifting
removed useless code
added Juggler contains and containsTweens methods
optimizing filters with bit shifting

previously we used an interger division because it was faster. this
division got much slower recently and bit shifting is pretty fast now -
so we move to bit shifting.
added DisplayObjectContainer.removeChildren
fixed index checks in DisplayObjectContainer
made DisplayObject.removeChildren more Dart like
added ObjectPool and used it in DisplayObject
added DisplayObject skewX and skewY
added mobile IE 10.0 to audio blacklist
replaced deprecated drawImage function
guarantee double types in matrix calculation
some tweaks to optimize dart2js output
added DisplayObject cache feature
deprecated MovieClip, new class is FlipBook