* 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)

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

Prevent NullPointerException if application activity is singleTop and minimized/restored from launcher icon. (#108)

In that case activity is reused and intent.getExtras() returns null.