Inspiration and making it work with "wrapper" component

Hi @ericvicenti ! Thank you for your work.

I'm currently writing [`react-electron-menu`](https://github.com/SamyPesse/react-electron-menu), and I'm trying an approach similar to yours.

But I'm blocked with the [`render`](https://github.com/SamyPesse/react-electron-menu/blob/master/src/render.js), which is similar to your `renderToFS` if my application uses a component like:

```js
class DefaultEditMenu extends React.Component {
render() {
const { children } = this.props;

return (



{children}

);
}
}
```

Basically the render doesn't handle wrapper components.

The same issue will exist with `react-fs-renderer`, if I do something like (not tested):

```js
class ProjectTemplate extends React.Component {
render() {
const { name, children } = this.props;

return (



{children}


);
}
}

class MyProject extends React.Component {
render() {
return (

);
}
}
```

The current rendering logic stops at the children of `MyProject`, and never "render" the `` to get its children.

What will be the best solution to fix this ? Or do you have nay advice on how I can implement `react-electron-menu` ?