code: public void subscribeWithNotifications(String channel, boolean subscribeOnReconnect, OnMessage onMessage){
  		_subscribeWithNotifications(channel, subscribeOnReconnect, onMessage, false);
  	}
docs: Subscribe the specified channel in order to receive messages in that
  channel with a support of Google Cloud Messaging.
  
  @param channel
  Channel to be subscribed
  @param subscribeOnReconnect
  Indicates if the channel should be subscribe if the event on
  reconnected is fired
  @param onMessage
  Event handler that will be called when a message will be
  received on the subscribed channel