Add custom post type archive page to menu screen

functions.php

<?php

//http://stackoverflow.com/questions/20879401/how-to-add-custom-post-type-archive-to-menu

add_action('admin_head-nav-menus.php', 'wpclean_add_metabox_menu_posttype_archive');

function wpclean_add_metabox_menu_posttype_archive() {
add_meta_box('wpclean-metabox-nav-menu-posttype', 'Custom Post Type Archives', 'wpclean_metabox_menu_posttype_archive', 'nav-menus', 'side', 'default');
}

function wpclean_metabox_menu_posttype_archive() {
$post_types = get_post_types(array('show_in_nav_menus' => true, 'has_archive' => true), 'object');

if ($post_types) :
    $items = array();
    $loop_index = 999999;

    foreach ($post_types as $post_type) {
        $item = new stdClass();
        $loop_index++;

        $item->object_id = $loop_index;
        $item->db_id = 0;
        $item->object = 'post_type_' . $post_type->query_var;
        $item->menu_item_parent = 0;
        $item->type = 'custom';
        $item->title = $post_type->labels->name;
        $item->url = get_post_type_archive_link($post_type->query_var);
        $item->target = '';
        $item->attr_title = '';
        $item->classes = array();
        $item->xfn = '';

        $items[] = $item;
    }

    $walker = new Walker_Nav_Menu_Checklist(array());

    echo '<div id="posttype-archive" class="posttypediv">';
    echo '<div id="tabs-panel-posttype-archive" class="tabs-panel tabs-panel-active">';
    echo '<ul id="posttype-archive-checklist" class="categorychecklist form-no-clear">';
    echo walk_nav_menu_tree(array_map('wp_setup_nav_menu_item', $items), 0, (object) array('walker' => $walker));
    echo '</ul>';
    echo '</div>';
    echo '</div>';

    echo '<p class="button-controls">';
    echo '<span class="add-to-menu">';
    echo '<input type="submit"' . disabled(1, 0) . ' class="button-secondary submit-add-to-menu right" value="' . __('Add to Menu', 'andromedamedia') . '" name="add-posttype-archive-menu-item" id="submit-posttype-archive" />';
    echo '<span class="spinner"></span>';
    echo '</span>';
    echo '</p>';

endif;
}

?>