starting to work on scene-graph
added LICENSE
initial (all still untested) CG rendering, ignores animations
added convenience/toy class MgImageProvider
better way of handling optional image encoding
fix includes
implement timeline node CG rendering
added -[MgNode foreachPathFromNode:handler:] (experimenting)
removed MgRenderer, MgDrawableNode has -renderInContext:[atTime:]
move MgCoderExtensions.{h,m} to util directory
also added -[MgNode foreachPathToNode:handler:] to reverse the array order
partially implemented -[MgDrawableNode nodesContainingPoint:]
make -nodesContainingPoint: slightly less useless
more hit-testing changes; probably not final
replaced MgLayerNode.affineTransform by scale, squeeze, skew, rotation
MgImageProvider has readonly image/URL/imageData properties
update README
added +[MgNode node] convenience method
added name property to MgNode
added -mg_encodeCGSize:forKey: and -mg_decodeCGSizeForKey: