.html($('selector')) copies the node instead move it

Hi.
In jquery this code moves a node inside other:
```js
$element = $('.element');
$container = $('.container');
$container.html($element);
```

But in cheerio, this generates a new element, so I get two: the outside and the inside of container. A way to fix this is using appendTo:

```js
$element.appendTo($container);
```

But I guess `html` should be fixed. Thanks.