message: marker -> event_id
diff: @@ -122,7 +122,7 @@ var TimelinePanel = React.createClass({
  if (this.props.manageReadMarkers) {
  const readmarker = this.props.timelineSet.room.getAccountData('m.fully_read');
  if (readmarker){
  - initialReadMarker = readmarker.getContent().marker;
  + initialReadMarker = readmarker.getContent().event_id;
  } else {
  initialReadMarker = this._getCurrentReadReceipt();
  }
  @@ -478,7 +478,7 @@ var TimelinePanel = React.createClass({
  if (ev.getType() !== "m.fully_read") return;
  - const markerEventId = ev.getContent().marker;
  + const markerEventId = ev.getContent().event_id;
  console.log('TimelinePanel: Read marker received from server', markerEventId);
  this.setState({
  @@ -1045,7 +1045,6 @@ var TimelinePanel = React.createClass({
  // events when viewing historical messages, we get stuck in a loop
  // of paginating our way through the entire history of the room.
  var stickyBottom = !this._timelineWindow.canPaginate(EventTimeline.FORWARDS);
  -
  return (
  <MessagePanel ref="messagePanel"
  hidden={ this.props.hidden }
  