code: function processDir (err) {
        // Fail if any error other then 550 is present, 550 is Directory Already Exists
        // these directories must exist to continue
        if (err) {
          if (err.code !== 550) { grunt.fail.warn(err); }
        } else {
          grunt.log.ok(messages.directoryCreated(directories[index]));
        }
  
        ++index;
        // If there is more directories to process then keep going
        if (index < directories.length) {
          server.raw('mkd', directories[index], processDir);
        } else {
          callback();
        }
      }
docs: Recursive helper used as callback for server.raw(mkd)
  @param {error} err - Error message if something went wrong