[fix] use ReactDOM.hydrate in AppRegistry.runApplication

Allows AppRegistry to hydrate server-side rendered apps.

Fix #733

src/apis/AppRegistry/renderApplication.js

@@ -10,7 +10,7 @@
  */
 
 import invariant from 'fbjs/lib/invariant';
-import { render } from 'react-dom';
+import { hydrate } from '../../modules/hydrate';
 import AppContainer from './AppContainer';
 import StyleSheet from '../../apis/StyleSheet';
 import React, { type ComponentType } from 'react';
@@ -22,7 +22,7 @@ export default function renderApplication<Props: Object>(
 ) {
   invariant(rootTag, 'Expect to have a valid rootTag, instead got ', rootTag);
 
-  render(
+  hydrate(
     <AppContainer rootTag={rootTag}>
       <RootComponent {...initialProps} />
     </AppContainer>,

src/modules/hydrate/index.js

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) 2016-present, Nicolas Gallagher.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noflow
+ */
+
+import { hydrate } from 'react-dom';
+export default hydrate;