code: public function addOption($short, $long, $arg, $description)
      {
          $this->parameters[] = array(
              $short,
              $long,
              $arg,
              $description
          );
          return $this;
      }
docs: Register a valid option
  @param $short string The single character version of this option
  @param $long string The long form of this option
  @param $arg string The name/type of parameter, shown in the help text. Set to false to disable the argument
  @param $description string The description of this option, shown in the help text.