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/BulletDynamics/Dynamics/btDiscreteDynamicsWorld.h

@@ -34,7 +34,7 @@ struct InplaceSolverIslandCallback;
 
 ///btDiscreteDynamicsWorld provides discrete rigid body simulation
 ///those classes replace the obsolete CcdPhysicsEnvironment/CcdPhysicsController
-class btDiscreteDynamicsWorld : public btDynamicsWorld
+ATTRIBUTE_ALIGNED16(class) btDiscreteDynamicsWorld : public btDynamicsWorld
 {
 protected:
 	
@@ -87,6 +87,8 @@ protected:
 public:
 
 
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+
 	///this btDiscreteDynamicsWorld constructor gets created objects from the user, and will not delete those
 	btDiscreteDynamicsWorld(btDispatcher* dispatcher,btBroadphaseInterface* pairCache,btConstraintSolver* constraintSolver,btCollisionConfiguration* collisionConfiguration);