CONVERTING_CLASS_TO_STRUCT_WIP
Merge pull request #116 from mono/master

b2DynaimicTree - Use array copy instead of for loop to copy old nodes.
fixed some missing code and added ref calls for transform objects.
more fixing on the solver. rotation momentum is computed now and the ricochet collision effect is working, somewhat.
Merge pull request #117 from totallyevil/CONVERT_CLASS_TO_STRUCT_WIP

Convert class to struct and fix struct copy back
fix for the debug draw and more struct copy back fixes.
another struct copy back fix.
Add CCDraw extension to iOS project.