Add compatibility CHTML-preview.js (it just calls the new one).

unpacked/extensions/CHTML-preview.js

@@ -0,0 +1,31 @@
+/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+
+/*************************************************************
+ *
+ *  MathJax/extensions/CHTML-preview.js
+ *  
+ *  Backward compatibility with old CHTML-preview extension.
+ *  
+ *  ---------------------------------------------------------------------
+ *  
+ *  Copyright (c) 2014-2015 The MathJax Consortium
+ * 
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+
+MathJax.Callback.Queue(
+  ["Require",MathJax.Ajax,"[MathJax]/extensions/FHTML-preview.js"],
+  ["loadComplete",MathJax.Ajax,"[MathJax]/extensions/CHTML-preview.js"]
+);