/**
  * Create a classes directory and autoload it.
  *
  * @param string          $directory
  * @param OutputInterface $output
  * 
  * @return $this
  */
 protected function createClassesDir($directory, $output)
 {
     File::mkdir($directory . '/app/classes');
     File::gitkeep($directory . '/app/classes');
     File::replaceOnce($directory . '/app/start/global.php', "app_path().'/models',", "app_path().'/models',\n\tapp_path().'/classes',");
     File::replaceOnce($directory . '/composer.json', "\"app/models\",", "\"app/models\",\n\t\t\t\"app/classes\",");
     $output->writeln('app/classes directory created and autoloaded');
     return $this;
 }