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/btCollisionShape.h

@@ -24,7 +24,7 @@ class btSerializer;
 
 
 ///The btCollisionShape class provides an interface for collision shapes that can be shared among btCollisionObjects.
-class btCollisionShape
+ATTRIBUTE_ALIGNED16(class) btCollisionShape
 {
 protected:
 	int m_shapeType;
@@ -32,6 +32,8 @@ protected:
 
 public:
 
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+
 	btCollisionShape() : m_shapeType (INVALID_SHAPE_PROXYTYPE), m_userPointer(0)
 	{
 	}