Help required - Incremental rendering to Sketch
👋 

I've been playing around a little more with react-sketchapp to see if we can use it internally for our design system - I've managed to create a basic proof-of-concept that allows you to dynamically render components to sketch via a webview plugin:

![webview2](https://user-images.githubusercontent.com/1606253/28328025-1009b91e-6bdd-11e7-9a16-fd78f01a2c28.gif)


However ideally I'd like to be able to incrementally render new Components to the document instead of re-rendering the document completely. I assume this will be something to do with the `render` method http://airbnb.io/react-sketchapp/docs/API.html#renderelement-container and using `Group` instead of `Page` but can't find any more documentation on what possible options there are.

It'd be great if someone could point me in the right direction, thanks!
