code: func (c *Client) RawRequest(url string) (*Response, *http.Response, error) {
  	response := new(Response)
  	resp, err := c.sling.New().Get(url).Receive(response, response)
  	return response, resp, relevantError(err, *response)
  }
docs: // RawRequest allows you to make any request you want. This will automatically add
  // the client/user tokens. Gives back exactly the response from foursquare.