twentyfourteen body classes

function twentyfourteen_body_classes( $classes ) {
	if ( is_multi_author() ) {
		$classes[] = 'group-blog';
	}

	if ( get_header_image() ) {
		$classes[] = 'header-image';
	} else {
		$classes[] = 'masthead-fixed';
	}

	if ( is_archive() || is_search() || is_home() ) {
		$classes[] = 'list-view';
	}

	if ( ( ! is_active_sidebar( 'sidebar-2' ) )
		|| is_page_template( 'page-templates/full-width.php' )
		|| is_page_template( 'page-templates/contributors.php' )
		|| is_attachment() ) {
		$classes[] = 'full-width';
	}

	if ( is_active_sidebar( 'sidebar-3' ) ) {
		$classes[] = 'footer-widgets';
	}

	if ( is_singular() && ! is_front_page() ) {
		$classes[] = 'singular';
	}

	if ( is_front_page() && 'slider' == get_theme_mod( 'featured_content_layout' ) ) {
		$classes[] = 'slider';
	} elseif ( is_front_page() ) {
		$classes[] = 'grid';
	}

	return $classes;
}
add_filter( 'body_class', 'twentyfourteen_body_classes' );