breaks on 10.0.0-alpha.*

This is due to how render doesn't append new dom anymore if it's being rendered already, also this.props.children is not always an array. I had a go at fixing it by doing some workaround like:

```js
this.remote = this.props.into.appendChild(document.createElement('div'));
```

But then I don't know Preact well enough to render directly into that remote, render will render inside the div only. Not the current behaviour.