Apple contribution for OSX SSE and iOS NEON optimizations unit tests, thanks to Jordan Hubbard, Ian Ollmann and Hristo Hristov.

For OSX:
cd build
./premake_osx xcode4
for iOS:
cd build
./ios_build.sh
./ios_run.sh

Also integrated the branches/StackAllocation to make it easier to multi-thread collision detection in the near future. It avoids changing the btCollisionObject while performing collision detection.

As this is a large patch, some stuff might be temporarily broken, I'll keep an eye out on issues.

src/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp

@@ -287,7 +287,7 @@ void btPersistentManifold::refreshContactPoints(const btTransform& trA,const btT
 			{
 				//contact point processed callback
 				if (gContactProcessedCallback)
-					(*gContactProcessedCallback)(manifoldPoint,m_body0,m_body1);
+					(*gContactProcessedCallback)(manifoldPoint,(void*)m_body0,(void*)m_body1);
 			}
 		}
 	}