-[IAP] Fixes crash when deallocating IAPManager
Merge pull request #442 from TrompoGames/IAPManager

[IAP] Fixes crash when deallocating IAPManager
Properly release WebGL extensions. See #442
Cosmetics
Make xhr response and responseText enumerable; see #448
Use XIB for launch screen; close #420
Allow 3x retina scaling for iPhone6; fix #453
Update Deployment Target to iOS 8 to silence launch screen warning
Added .playbackRate property for Audio; close #388
Update SocketRocket lib
Removed deprecated volume property for Videos
Fixed various deprecated stuff
Fixed deprecations for GameCenter
Merge branch 'master' of github.com:phoboslab/Ejecta