Add Xcode 6.2 simulators
Drop iOS 7.0.3 from Xcode 6 sims; not supported on 10.10
Replace largest/latest with iPhone 6/6+
Parse XC 6.2b version directly
Clean-up physical device list
Merge pull request #15 from jmoody/feature/update-to-support-xcode6.2-testing

Update to support Xcode 6.2 beta testing