Bump dependencies: Polyfill and CodeMirror

reference.html

@@ -603,7 +603,7 @@ function which implements the logic for walking over the array.<p>
 </ol>
 </section>
 
-<script src="https://cdn.rawgit.com/inexorabletash/polyfill/v0.1.16/polyfill.min.js"></script>
+<script src="https://cdn.rawgit.com/inexorabletash/polyfill/v0.1.25/polyfill.min.js"></script>
 <script>
 (function buildTOC(el) {
   var html = [];