added inflateXBy:yBy:
added 'nativeWidth' and nativeHeight' properties
added 'angle', 'scaleX' and 'scaleY' properties to the matrix class
added clipping support to sprite and render support classes
setRepeat: and setSmoothing: now only apply if the new value is different
added method 'adjustTexCoords:numTexCoords:startIndex:stride:'
added 'SPContext', currently manages native context, viewport, scissor box, and render textures
implemented fragment filters, added sample scenes to demo project