iOS 8 subscribed fix

* iOS 8 - Correctly reports players as not subscribed on our site if they said Don't Allow to the push permission prompt.
* iOS 8 - If users choose to change notification settings in the system setting then next time they go back to your app gamethrive.com will reflect the change.
   - In iOS 7.x a user can go from not subscribed to subscribe if they go to in the system settings and enable notifications and then the app is cold started.
* IdsAvailable now gets called a 2nd time on iOS 7.x if you delay the prompt and they say yes.
   - Also for iOS 8 we fixed IdsAvailable to not include a push token if they said no to the push permissions prompt.
Merge branch 'master' of https://github.com/GameThrive/ios-push-plugin