docs: def url_add_params(url, **kwargs):
      """
      Add parameters to an url
  
      >>> url_add_params('http://example.com/', a=1, b=3)
      'http://example.com/?a=1&b=3'
      >>> url_add_params('http://example.com/?c=8', a=1, b=3)
      'http://example.com/?c=8&a=1&b=3'
      >>> url_add_params('http://example.com/#/irock', a=1, b=3)
      'http://example.com/?a=1&b=3#/irock'
      >>> url_add_params('http://example.com/?id=10#/irock', a=1, b=3)
      'http://example.com/?id=10&a=1&b=3#/irock'
      """
      parsed_url = urlparse.urlsplit(url)
      params = urlparse.parse_qsl(parsed_url.query)
      parsed_url = list(parsed_url)
  
      for pair in kwargs.iteritems():
          params.append(pair)
  
      parsed_url[3] = urllib.urlencode(params)
      return urlparse.urlunsplit(parsed_url)