No clear way to access ReactDOMServer in React ^0.14.0

[Finetuned]

Since the separation of ReactDOM and ReactDOMServer since React 0.14 there is no clear way to access from ReactDOMServer after loading react-dom.js

In an earlier issue, I posted enough code to load ReactDom into the ReactJS class but I don't see a way to write the equivalent of the following commonJS require in php…

import ReactDOMServer from 'react-dom/server' 

cc @stoyan

[Finetuned]

Fixed by @zpao in 05a69cd