message: allow using tab to navigate room list smarter
diff: @@ -85,6 +85,10 @@ var LeftPanel = React.createClass({
  let handled = false;
  switch (ev.keyCode) {
  + case KeyCode.TAB:
  + this._onMoveFocus(ev.shiftKey);
  + handled = true;
  + break;
  case KeyCode.UP:
  this._onMoveFocus(true);
  handled = true;
  