Update osx_setup.sh
Update osx_setup.sh

Address issue #624 and apply suggested coding style.
pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent