docs: function(pollInterval) {
        var self = this;
        if (pollInterval) {
          this.__pollInterval = pollInterval;
        }
        // have only 1 poll going at a time
        if (this.__pollStarted) {
          return;
        } else {
          this.__pollStarted = true;
          this.pollTimeoutId = window.setInterval(function() {
            self.__poll();
          }, this.__pollInterval);
          this.__poll();
        }
      }