code: function(url) {
              if (url == null) return this;
              if (url.length > 0 && url[0] == "/") {
                  url = url.replace("/", "");
              }
              var matched = _.any(this.handlers, function(handler) {
                  if (handler.route.test(url)) {
                      handler.callback(url);
                      return true;
                  }
                  return false;
              });
              logging.log("handle state ", url, matched != null);
              return matched;
          }
docs: /*
  Handle a state changement in history