Bump polyfill, use minified

index.htm

@@ -9,7 +9,7 @@
 <link rel="stylesheet" href="styles.css">
 <link rel="stylesheet" href="display.css">
 
-<script src="polyfill/polyfill.js?update=2012-02-08"></script>
+<script src="polyfill/polyfill.min.js?update=2015-05-31"></script>
 <script src="polyfill/keyboard.js"></script>
 
 <!-- CodeMirror syntax highlighting - this is optional -->

reference.htm

@@ -601,7 +601,7 @@ function which implements the logic for walking over the array.<p>
 </ol>
 </section>
 
-<script src="polyfill/polyfill.js"></script>
+<script src="polyfill/polyfill.min.js"></script>
 <script>
 (function buildTOC(el) {
   var html = [];