removed obsolete imports
added additional textfield init method
added 'onRootCreated' callback block in SPViewController
enhanced guessing of PMA settings of textures

Not all PNGs in a project are preprocessed by Xcode: files within folders are ignored.
added 'purgeBuffers' method to 'SPRenderSupport' class
enhanced pma guessing to cope with absolute paths
added quad batch compilation and using it for sprite flattening
fixed warnings about icons in demo
fixed inflate/deflate documentation
added NSXMLParser extension for simple block-based parsing
bitmap fonts can now be loaded from NSData; added default MINI bitmap font
optimized embedded PNG for MINI bitmap font
using blocks for XML parsing in texture atlas
changed event block argument type to 'id', because that makes it easier to use with custom event classes
changed "SPRootCreated" block argument type to 'id', because that makes it easier to use
re-implemented [SPTexture emptyTexture]
added methods to set all point and rectangle members simultaneously
optimized bitmap font rendering by using SPQuadBatch
added 'autoScale' property to 'SPTextField'
added 'createSprite' method to 'SPBitmapFont'