Fixed Navbar setting not working with Bootstrap alpha 6

It seems that the classes have changed, please replace:

bootstrap_barrio.theme:

  // Define navigation position
  switch (theme_get_setting('bootstrap_barrio_navbar_top_position')) {
	case 'fixed-top':
	  $variables['navbar_top_attributes']['class'][] = 'fixed-top';
	  break;
	case 'fixed-bottom':
	  $variables['navbar_top_attributes']['class'][] = 'fixed-bottom';
	  break;
  }
  switch (theme_get_setting('bootstrap_barrio_navbar_position')) {
	case 'fixed-top':
	  $variables['navbar_attributes']['class'][] = 'fixed-top';
	  break;
	case 'fixed-bottom':
	  $variables['navbar_attributes']['class'][] = 'fixed-bottom';
	  break;
  }