changed stage3d 'context3d not available' error message (closes #263)
avoiding floating point problem in 'loadQueue' (closes #270)
Merge branch 'master' of github.com:PrimaryFeather/Starling-Framework
added protected 'addBitmapTexture' method to allow subclass to preprocess bitmaps
Merge branch 'master' of github.com:PrimaryFeather/Starling-Framework