Update for 0.14

[zpao]

@spicyj made some changes in the React repo to use ReactDOM. We should do that here too as well as bump versions to 0.14 once we ship.

[zorfling]

Yep, I'm trying to follow the tutorial, but it's for 0.14.0 and the starter code repo is for 0.13.0. (and the cdn doesn't have 0.14.0 yet?
For anyone else trying this in the interim, I just used the following scripts:

<script src="https://fb.me/react-0.14.0.js"></script>
<script src="https://fb.me/react-dom-0.14.0.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>