Add Support for iOS8 Interactive Notifications

Update AppleNotificationPayload to support new iOS8 category field.
Revert "Add Support for iOS8 Interactive Notifications"

This reverts commit 9a9b876f07f35465a290638c36b5aa210482acb1.
Revert "Revert "Add Support for iOS8 Interactive Notifications""

This reverts commit 9e56e9d7a849a4aaccbe836ece34e18ac91d9945.
Revert "Revert "Revert "Add Support for iOS8 Interactive Notifications"""

This reverts commit 5532d603a7faaf60955de65d8c6bf4ce9b070751.
Add Support for iOS8 Interactive Notifications

Add support for the new iOS8 category field to allow for interactive
notifications.