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/CollisionDispatch/SphereTriangleDetector.cpp

@@ -158,7 +158,6 @@ bool SphereTriangleDetector::collide(const btVector3& sphereCenter,btVector3 &po
 				depth = -(radius-distance);
 			} else
 			{
-				btScalar distance = 0.f;
 				resultNormal = normal;
 				point = contactPoint;
 				depth = -radius;