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.

build/ios_build.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+./premake4_osx --ios xcode4
+xcodebuild -project xcode4ios/AppUnitTest.xcodeproj -configuration Release -arch armv7