Update attributes

Update attributes and element for changing these data after creating.
Exapmle:
<?Menu::handler('top')->add('home', 'Homepage') ->add('about',
'About')?>
<header>
{{Menu::handler('top',array('class'=>'top_menu'))}}
</header>
…
<footer>
{{Menu::handler('top',array('class'=>'bottom_menu'))}}
</footer>