XCode 6.0 GM broke playgrounds targetted at OSX. Some of our playgrounds were targetted at 'macosx' and some were targetted (correctly) at 'iphonesimulator'. The 'macosx' targets were fixed and the playgrounds updated to conform to the latest XCode changes.
Merge pull request #120 from jocelynlih/paul

XCode 6.0 GM broke playgrounds targeted at OSX. Some of our playgrounds...