In Xcode 6 you would click on Xcode -> Preferences -> Account -> View Details -> then there would be a little circular arrow. That is gone and there is now a \"Download All\
You can delete directly your Provisioning Profiles by running:
rm /Users/[userName]/Library/MobileDevice/Provisioning\ Profiles/*
Then re-download your profiles, Xcode -> Preferences -> Account -> View details... -> Download All
Your list in Target -> Build settings -> Code signing -> Provisioning Profiles will be updated.
YM