Replace React.createClass with create-react-class

Summary:
This replaces all uses of `React.createClass` with `createReactClass` from the `create-react-class` package, attempting to match use of `var` and `const` according to local style.

Fixes #14620
Refs #14712
Closes https://github.com/facebook/react-native/pull/14729

Differential Revision: D5321810

Pulled By: hramos

fbshipit-source-id: ae7b40640b2773fd89c3fb727ec87f688bebf585

Libraries/Text/TextUpdateTest.js

@@ -12,6 +12,7 @@
 'use strict';
 
 var React = require('react');
+var createReactClass = require('create-react-class');
 var ReactNative = require('react-native');
 var TimerMixin = require('react-timer-mixin');
 var {
@@ -22,7 +23,8 @@ var {
 
 var TestManager = NativeModules.TestManager || NativeModules.SnapshotTestManager;
 
-var TextUpdateTest = React.createClass({
+var TextUpdateTest = createReactClass({
+  displayName: 'TextUpdateTest',
   mixins: [TimerMixin],
   getInitialState: function() {
     return {seeMore: true};