Add the mobile responsive menu - "footer nav with anchor" - add to functions.php

/**
 * Add the mobile responsive menu - "footer nav with anchor" 
 *
 * @author John Sundberg
 * @link http://blackhillswebworks.com/?p=4852
 */

	// Register "Responsive Footer Menu" widget area 
	add_action( 'widgets_init', 'bhww_register_responsive_footer_menu_widget_area' );
 
	function bhww_register_responsive_footer_menu_widget_area() {
 
		// Added this conditional for the WordPress 3.7 update
		if ( function_exists( 'genesis_register_sidebar' ) ) {
		
			genesis_register_sidebar( array(
				'id'            => 'footer-nav-menu',
				'name'          => __( 'Responsive Footer Menu', '' ),
				'description'   => __( 'This widget area is displayed above the footer widgets on mobile devices (600px wide or less), and should be used for one or more Custom Menu widgets.', '' ),
			) );
			
		}
		
	}
	
 
	// Check to see if there are any widgets in the Responsive Footer Menu widget area
	if ( is_active_sidebar( 'footer-nav-menu' ) ) {
	
		// Add the header link and footer menu HTML containers
		add_action( 'genesis_before', 'bhww_footer_anchor_responsive_menu' );
	 
		function bhww_footer_anchor_responsive_menu() {
			
			// Add the header navicon container, BEFORE the #title-area (.title-area in HTML5)
			add_action( 'genesis_header', 'bhww_footer_anchor_header_link', 6 );
			
			function bhww_footer_anchor_header_link() {
			
				echo '<div class="mobile-footer-nav-link"><a href="#mobile-footer-nav-menu" class="btn button mobile-nav-link-button"><span class="mobile-footer-nav-link-text">Menu</span> <span class="mobile-footer-nav-link-icon">&#9660;</span></a></div>';
				
			}
			
			
			// Add the footer menu container, BEFORE the footer
			add_action( 'genesis_before_footer', 'bhww_footer_anchor_menu_container', 5 );
			
			function bhww_footer_anchor_menu_container() {
			
				echo '<div id="mobile-footer-nav-menu"><div class="wrap">';
				
				echo '<div class="mobile-footer-nav-menu-top-link"><a href="#" class="btn button">Back to Top</a></div>';
				
				genesis_widget_area( 'footer-nav-menu', array(
			
					'before'=>	'<div class="mobile-footer-nav-menu-widgets widget-area">', 
					'after'	=>	'<div class="clear"></div></div><!-- end .mobile-footer-nav-menu-widgets -->'
			
				) );
				
				echo '</div></div>';
				
			}

		}
		
	}

Added a conditional to check if genesis_register_sidebar function exists. If you were using this code in a mu-plugins file, then the WordPress 3.7 update would probably throw an error. This update prevents that error from happening.