Merge in react-storybook, add yarn lockfile

storybook/config.js

@@ -0,0 +1,16 @@
+import { configure } from '@kadira/storybook';
+import React from 'react';
+import { storiesOf, action } from '@kadira/storybook';
+
+import './storybook.css'
+
+window.storiesOf = storiesOf;
+window.action    = action;
+window.React     = React;
+
+function loadStories () {
+  require('./stories/loading_indicator.story.jsx');
+  require('./stories/button.story.jsx');
+}
+
+configure(loadStories, module);