Title support, notification clearing & open count
- Added support for notification title on iOS 8.2+ devices.
- Fixed bug where notifications would clear when opening / resuming the app.
- Notifications will still be cleared in this way when a badge is set.
- This is due to an iOS limitation where clearing the badge count has a side effect of clearing all notifications from the app.
- iOS 6 & 7 - When a notification is opened all other notifications from the app will still be cleared.
- This logic remains otherwise notifications can be tapped on multiple times.
- Notifications will still be cleared in this way when a badge is set.
- Fixed bug where if content-available was set the notification would be marked opened when received and again when it was opened.