message: Only show group settings cog to members
  Non-members have no settings to change.
diff: @@ -964,6 +964,7 @@ export default React.createClass({
  </AccessibleButton>,
  );
  } else {
  + if (summary.user && summary.user.membership === 'join') {
  rightButtons.push(
  <AccessibleButton className="mx_GroupHeader_button"
  onClick={this._onEditClick} title={_t("Community Settings")} key="_editButton"
  @@ -971,6 +972,7 @@ export default React.createClass({
  <TintableSvg src="img/icons-settings-room.svg" width="16" height="16" />
  </AccessibleButton>,
  );
  + }
  if (this.props.collapsedRhs) {
  rightButtons.push(
  <AccessibleButton className="mx_GroupHeader_button"
  