Update

* Removed dependencies on GLKView and GLKViewController
* Moved iOS required version to 6.0, updated many methods to use their newer alternatives
* Added an SPEffect and SPUniform class, which enables easy use and creation of custom shaders
* Added an SPGroupFilter class which batches multiple filters together
* SPTouch, SPTouchEvent and SPTouchProcessor are now inline with Starling
* Mac support isn't far away now, much of the iOS specific methods have been changed
* Using Vertex Array Objects now for SPQuadBatch