docs: function loadRoomNo(dataDir) {
      var files, file, tokens, roomNum, maxRoomNum;
      var i, len;
  
      maxRoomNum = 0;
  
      files = fs.readdirSync(dataDir);
  
      i = -1, len = files.length;
      for ( ; ++i < len ; ) {
          file = path.join(dataDir, files[i]);
          if (fs.lstatSync(file).isDirectory()) {
              tokens = file.split('room');
              roomNum = parseInt(tokens[1], 10);
              if (roomNum > maxRoomNum) maxRoomNum = roomNum;
          }
      }
      return maxRoomNum;
  }