def notify(step, options = {})
      notifiers.each do |notifier|
        notifier.notify(step, default_payload.merge(options))
      end
    end
def notify(step, options = {})
      notifiers.each do |notifier|
        notifier.notify(step, default_payload.merge(options))
      end
    end
Internal: Notifies other objects that an event has occurred

 step    - String event name
 options - Hash of options to be sent as data payload