Contains utility classes for the canvas library.

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	Interface	Description
	ICollectionModel	The interface for a collection that will notify registered listeners of changes to its contents using CollectionEvents.

	Class	Description
	BitmapCache	A global cache for bitmap data.
	CloneableBitmap	A Bitmap implementation which wraps BitmapData into a cloneable Bitmap.
	CloneableSpriteAsset	A cloneable SpriteAsset which wraps a DisplayObject.
	ColorStruct	A convenience class to work with colors and alpha values
	CompositeCollectionModel	A ICollectionModel implementation that is the composite of two models.
	ImageLoader	Utility class that can be used to load an image from an url.
	PNGEncoder	Class that converts BitmapData into a valid PNG
	Util	Provides static utility functions.