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/CollisionShapes/btStridingMeshInterface.h

@@ -27,13 +27,15 @@ subject to the following restrictions:
 ///	The btStridingMeshInterface is the interface class for high performance generic access to triangle meshes, used in combination with btBvhTriangleMeshShape and some other collision shapes.
 /// Using index striding of 3*sizeof(integer) it can use triangle arrays, using index striding of 1*sizeof(integer) it can handle triangle strips.
 /// It allows for sharing graphics and collision meshes. Also it provides locking/unlocking of graphics meshes that are in gpu memory.
-class  btStridingMeshInterface
+ATTRIBUTE_ALIGNED16(class ) btStridingMeshInterface
 {
 	protected:
 	
 		btVector3 m_scaling;
 
 	public:
+		BT_DECLARE_ALIGNED_ALLOCATOR();
+		
 		btStridingMeshInterface() :m_scaling(btScalar(1.),btScalar(1.),btScalar(1.))
 		{