Examples

        <%= nav pills => [
                    ['Item 1', ['#'] ],
                    ['Item 2', ['#'], active ],
                    ['Item 3', ['#'] ],
                    ['Item 4', ['#'], disabled ],
                ]
        %>

        <ul class="nav nav-pills">
            <li><a href="#">Item 1</a></li>
            <li class="active"><a href="#">Item 2</a></li>
            <li><a href="#">Item 3</a></li>
            <li class="disabled"><a href="#">Item 4</a></li>
        </ul>