Include react-create-class in generator for non-es6

Author: BookOfGreg

lib/generators/react/component_generator.rb

@@ -132,7 +132,7 @@ def file_header
           if options[:es6]
             %|import React from "react"\nimport PropTypes from "prop-types"\n|
           else
-            %|var React = require("react")\nvar PropTypes = require("prop-types")\n|
+            %|var React = require("react")\nvar PropTypes = require("prop-types")\nvar createReactClass = require('create-react-class');|
           end
         else
           ''

lib/generators/templates/component.js.jsx

@@ -1,4 +1,4 @@
-<%= file_header %>var <%= component_name %> = React.createClass({
+<%= file_header %>var <%= component_name %> = createReactClass({
 <% if attributes.size > 0 -%>
   propTypes: {
 <% attributes.each_with_index do |attribute, idx| -%>