Add a home link to wp_page_menu() by default

gistfile1.php

<?php 
/**
 * Add a home link to wp_page_menu() by default
 */
function twentyfourteen_page_menu_args( $args ) {
        $show_on_front = get_option('show_on_front');
        if ( $show_on_front == 'posts' ) { 
	      $args['show_home'] = true;
        }
        return $args;
}
add_filter( 'wp_page_menu_args', 'twentyfourteen_page_menu_args' );