message: Remove spurious cancel button
  That appeared if you clicked on a room from the room directory
  (it didn't do anything). It's only supposed to be shown when
  editing room settings.
diff: @@ -56,7 +56,7 @@ module.exports = React.createClass({
  editing: false,
  inRoom: false,
  onSaveClick: function() {},
  - onCancelClick: function() {},
  + onCancelClick: null,
  };
  },
  