2.2.5

Adds the ability to override the two firebase services (for registering a new user token and for receiving a message) and still enable NearIT push functionality. Useful when integrating NearIT with a legacy push system.

The two method to call our routines are:
to save the registration device token

NearInstanceIDListenerService.sendRegistrationToServer(String token)

and to handle a push message

NearFcmListenerService.processRemoteMessage(RemoteMessage remoteMessage)