code: function transformResponse(transform) {
  
    assert.ok(transform);
    assert.ok(transform instanceof Function);
  
    var originalStatus, originalJson, reqClosure;
  
    return function (req, res, next) {
      originalStatus = res.status;
      originalJson = res.json;
      reqClosure = req;
      res.status = setStatus;
      res.json = sendJson;
      return next();
    }
  
    function setStatus(status) {
      this.__status = status;
      return this;
    }
  
    function sendJson(body) {
      this.__body = body;
      var B = new Bundle(transform, reqClosure, this);
      originalStatus.call(this, B.status);
      return originalJson.call(this, B.body);
    }
  
  }
docs: transformResponse - the factory for middleware that transforms response
  
  @param  {Function} transform the function transfomrs `this.status` and `this.body`
  @return {Function}           express middleware that transfomrs response