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/ConstraintSolver/btSliderConstraint.h

@@ -60,7 +60,7 @@ enum btSliderFlags
 };
 
 
-class btSliderConstraint : public btTypedConstraint
+ATTRIBUTE_ALIGNED16(class) btSliderConstraint : public btTypedConstraint
 {
 protected:
 	///for backwards compatibility during the transition to 'getInfo/getInfo2'
@@ -155,6 +155,8 @@ protected:
 	//------------------------    
 	void initParams();
 public:
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+	
 	// constructors
     btSliderConstraint(btRigidBody& rbA, btRigidBody& rbB, const btTransform& frameInA, const btTransform& frameInB ,bool useLinearReferenceFrameA);
     btSliderConstraint(btRigidBody& rbB, const btTransform& frameInB, bool useLinearReferenceFrameA);