Support for `insertAdjacentHTML`

Is there plans to support [`element.insertAdjacent`](https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentHTML) in jsdom?

``` js
document.body.insertAdjacentHTML('afterbegin', '<p>Hello World</p>')
```

Results in:

```
TypeError: document.body.insertAdjacentHTML is not a function
```
