Support om-next about re-natal

[drapanjanas]

OK, here is the first problem:
To enable "yellow box" warnings on screen in ReactNative app you either:

1. use AppRegistry.registerComponent then your component will be wrapped to support yellow box
2. use AppRegistry.registerRunnable and pass a function which uses renderApplication, which will wrap your component and will call React.render (same as it is done in registerComponent)
   I was able to use AppRegistry.registerComponent with stateless components (I am following the Quick Start to learn om.next), but it is not possible when you want to attach an om/reconciler. As far as I understand, it is limited by design that reconciler can be only attached to the root element (not to factory, or component class). Therefore you can not use your AppRoot component in any other way, but directly mount it as root with om/add-root!, meaning you can noy use any of the options to make "yellow box" work.