Hide React-Hot-Loader (behind sugar)

React-Hot-Loader is a dev-time tool, but it requires some configuration steps. That's not cool.

### Idea
1. Continue development of `hot-loader/react-dom` and `hot-loader/react`. Including their versions as a webpack plugins for RHL.
2. Embed `react-hot-loader/root` into `hot-loader/react-dom`
3. Wrap `ReactDOM.render` with `hot`

Now RHL could be `injected` to the app without any code changes - just rewire `react-dom` and add webpack/babel plugin.