def <<(controller)
      options = controller.cli_options

      unless include?(controller)
        option_parser.add(*options) if options
        super(controller)
      end
      self
    end
def <<(controller)
      options = controller.cli_options

      unless include?(controller)
        option_parser.add(*options) if options
        super(controller)
      end
      self
    end
@param [ Controller::Base ] controller

 @retun [ Controllers ] self