Thoughts on making the modal draggable?

I'm looking at https://github.com/mzabriskie/react-draggable. However, you cannot do this:

```
<Draggable><Modal /></Draggable>
```

nor can you do this:

```
<Modal><Draggable>Contents</Draggable></Modal>
```

because of the way modalportal works. Any suggestions?
