docs: function streamFile(res, fileName, status, contentType, prefix, suffix) {
      res.statusCode = status || 200;
      res.setHeader('Content-Type', contentType);
      if (prefix) {
          res.write(prefix);
      }
  
      var s = fs.createReadStream('templates/' + fileName, {encoding: 'utf8'});
      s.on('readable', getReadableHandler(s, res));
      s.on('end', function() {
          if (suffix) {
              res.write(suffix);
          }
          res.end();
      });
  }