How remove a old provisioning profile in xcode 5?
The best way to do this in XCode 5 is using an iPhone Configuration Utility. It lets you manually delete duplicates of provisioning profiles with ease and speed.
I keep Xcode closed when I do this just in case.
Edit: For anyone wondering how to actually 'delete'. There are only two ways: a. menu -> b. Hit the / keyboard button.
You can delete the files directly from ~/Library/MobileDevice/Provisioning Profiles
Open finder, ⌘-Shift-G, and paste in the above path. Restart Xcode afterward.
Check out this related question for other suggestions.