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/LinearMath/btAlignedAllocator.cpp

@@ -119,7 +119,7 @@ void*   btAlignedAllocInternal  (size_t size, int alignment,int line,char* filen
  
  real = (char *)sAllocFunc(size + 2*sizeof(void *) + (alignment-1));
  if (real) {
-   ret = (void*) btAlignPointer((real + 2*sizeof(void *), alignment);
+   ret = (void*) btAlignPointer(real + 2*sizeof(void *), alignment);
    *((void **)(ret)-1) = (void *)(real);
        *((int*)(ret)-2) = size;