code: function(config, extras, callback) {
  
      // load all files in the source folder
      vfs.src(config.fonts.files)
  
        // vinyl-fs dest automatically determines whether a file
        // should be updated or not, based on the mtime timestamp.
        // so we don't need to do that manually.
        .pipe(vfs.dest(path.join(extras.destination, config.fonts.destination)))
        .on('finish', function() {
          callback(null, config, extras);
        });
    }
docs: simply move all font files at setup