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.

Demos/HeightFieldFluidDemo/BulletHfFluid/btHfFluidBuoyantConvexShape.h

@@ -31,7 +31,10 @@ public:
 	~btHfFluidBuoyantConvexShape ();
 	void generateShape (btScalar radius, btScalar gap);
 
-	btConvexShape* getConvexShape () { return m_convexShape; }
+	const btConvexShape* getConvexShape () const
+	{ 
+		return m_convexShape; 
+	}
 
 	virtual void getAabb(const btTransform& t,btVector3& aabbMin,btVector3& aabbMax) const;
 	virtual void	setMargin(btScalar margin);