Test and fix BitmapData::draw and BitmapData::getPixel.
Simplify DisplayObject::width/height accessors.
Remove unused GradientType stub.
Remove describeProperty util.
Move _flushPendingScripts logic to MovieClip, cleanup Stage.
Fix regressions.
Merge branch 'display' of https://github.com/tobeytailor/shumway into master.