def register_event(id, info = EMPTY_HASH)
      Notifications.events[id] = Event.new(id, info)
    end
def register_event(id, info = EMPTY_HASH)
      Notifications.events[id] = Event.new(id, info)
    end
Register an event

 @param [String] id A unique event key
 @param [Hash] info

 @api public