Adding Xcode 5 GM compatibility UUID, recommended XC5 project settings.

I always find XVim is ahead of the curve when it comes to Xcode version compatibility, so I've followed [one of their latest changes](https://github.com/JugglerShu/XVim/pull/441/files) to do the same for Alcatraz. Let me know if you'd like anything else in this PR; I'm happy to accommodate!