message: Mark room as read when escape is pressed
diff: @@ -560,6 +560,12 @@ export default createReactClass({
  handled = true;
  }
  break;
  +
  + case Key.ESCAPE:
  + this._messagePanel.forgetReadMarker();
  + this.jumpToLiveTimeline();
  + handled = true;
  + break;
  }
  if (handled) {
  