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/EPAPenDepthDemo/PenetrationTestBullet.cpp

@@ -210,7 +210,8 @@ void MyConvex::Render(bool only_wireframe, const btVector3& wire_color) const
 	const float Scale = 1.0f;
 	glPushMatrix();
 
-	btScalar glmat[16];	//4x4 column major matrix for OpenGL.
+	ATTRIBUTE_ALIGNED16(btScalar) glmat[16];	//4x4 column major matrix for OpenGL.
+
 	mTransform.getOpenGLMatrix(glmat);
 #ifndef BT_USE_DOUBLE_PRECISION
 	glMultMatrixf(&(glmat[0]));