Allow closeable when a toolbar is specified

[mandolyte]

currently if the property closeable is true, then a tool bar cannot be used. Code in Card.js:

        {closeable ? (
          <CloseIcon
            id='settings_card_close'
            className={classes.pointerIcon}
            onClick={onClose}
          />
        ) : (
          <FlexDiv>
            <Extensible onRenderItems={onRenderToolbar}>
              {alert && (
                <IconButton
                  aria-label='warning'
                  onClick={onAlertClick}
                  className={classes.margin}
                  key='alert-button'
                >
... elided ...
            {!disableSettingsButton && (
              <MoreVertIcon
                id={cardMenuId}
                className={classes.pointerIcon}
                onClick={onMenuClick}
              />
            )}
          </FlexDiv>