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/btContinuousConvexCollision.cpp

@@ -62,7 +62,6 @@ void btContinuousConvexCollision::computeClosestPoints( const btTransform& trans
 		const btConvexShape* convexShape = m_convexA;
 		const btStaticPlaneShape* planeShape = m_planeShape;
 		
-		bool hasCollision = false;
 		const btVector3& planeNormal = planeShape->getPlaneNormal();
 		const btScalar& planeConstant = planeShape->getPlaneConstant();