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
cleaned up comments, removed a few accidentally committed changes
Merge pull request #16 from Gamua/master
SPContext fixes and cleanup, added drawable width/height to SPViewController
fixed matrix scale math, added skew x/y, renamed angle to rotation for consistency with display object
cleaned up clipping, changed to be closer to Starling's implementation
added 'alignPivotToCenter' and 'alignPivotX:pivotY:'
added SP_EXTERN to SPVertex functions, requires extern "C" when compiled with C++
small documentation fixes
added missing 'release' call