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/btConcaveShape.h

@@ -33,12 +33,14 @@ typedef enum PHY_ScalarType {
 
 ///The btConcaveShape class provides an interface for non-moving (static) concave shapes.
 ///It has been implemented by the btStaticPlaneShape, btBvhTriangleMeshShape and btHeightfieldTerrainShape.
-class btConcaveShape : public btCollisionShape
+ATTRIBUTE_ALIGNED16(class) btConcaveShape : public btCollisionShape
 {
 protected:
 	btScalar m_collisionMargin;
 
 public:
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+	
 	btConcaveShape();
 
 	virtual ~btConcaveShape();