clear badge for ios 9 when clearing all notifications

* feature(android): add support for badge count (#1)

Using Leolin's ShortcutBadger we are able to support any badge counts that are sent as part of the notifications data-payload.

* refactor(android): expand badge support (#3)

* Update RNFIRMessaging.h

* Update RNFIRMesssaging.m

Fixed typo that caused XCode error: undeclared identifier userInfo

Update iOS RN header paths

sample project

I was having build problems and was not able to use the underlying `FIRMessaging` object until I made this change.

This is just to provide a brief usage example and note about sending
upstream messages with `react-native-fcm`

Android notification + data push notifications when the app is in the foreground only passes the data packet through, this changes it to pass the notification data too

I was having build problems and was not able to use the underlying `FIRMessaging` object until I made this change.

In conforming with the method signatures as is the case with the
android version, I limited the arguments for `send()` to just
`senderId` and `payload`. This can still be improved upon by adding
`sendDataMessageSuccess` and `sendDataMessageFailure` to events being
fired across the bridge to Js.