component/container: support dom node children

[yiminghe]

KISSY.use('component/container,node,component/control', function (S, Container, $, Control) {
    var control = new Control({
        content: 'control'
    });
    var container = new Container({
        render: '#holder',
        children: [$('<div>dom1</div>'), control, $('<div>dom3</div>')]
    });
    container.render();
    // container.destroy();
});