/**
  * Install the Font Awesome library.
  *
  * @param string          $directory
  * @param OutputInterface $output
  * 
  * @return $this
  */
 protected function installFontAwesome($directory, $output)
 {
     if (!File::exists($directory . '/public/assets/libs/font-awesome')) {
         File::copyFolder(dirname(__FILE__) . '/../stubs/public/assets/libs/font-awesome', $directory . '/public/assets/libs/font-awesome');
     }
     $output->writeln('font-awesome installed');
     return $this;
 }