Support for onChange event?

First off let me say WOW this is amazing! The draft-js ecosystem is so fragmented right now and this brings everything together so nicely. Well done!!

Is there support for on an `onChange` event or similar?

The use case being to pass the `content` through props to a "live" preview component as the user types or inserts an image for example.... something like this:


_Another question_ (I don't want to bombard your repo with issues that aren't really issues)... Is there a way to set the initial content of the editor based on props? Use case being editing a pre-existing bit of content.