Add login menu item to menus with 'My Account'

functions.php

<?php

/**
 * Add login link to my account menu.
 * 
 * Add this to your theme functions file
 */
add_filter( 'wp_nav_menu_items', 'woocommerce_nav_menu_items_login', 10, 2 ); 
function woocommerce_nav_menu_items_login( $items, $args ) {
	if ( get_option('woocommerce_menu_logout_link')=='yes' && strstr($items, get_permalink(woocommerce_get_page_id('myaccount'))) && !is_user_logged_in() )
		$items .= '<li class="login"><a href="'. get_permalink(woocommerce_get_page_id('myaccount')) .'">'.__('Login', 'woocommerce').'</a></li>';

    return $items;
}

?>

this is great, using it now.