Use maxcdn for bootstrap.min.js

Author: ashawley

_includes/footer.html

@@ -65,7 +65,7 @@
     <script src="{{ site.baseurl }}/resources/js/vendor/jquery.backstretch.min.js" type="text/javascript" ></script>
 
     <!-- Bootstrap JS -->
-    <script src="{{ site.baseurl }}/resources/js/vendor/bootstrap.min.js" type="text/javascript" ></script>
+    <script src="https://maxcdn.bootstrapcdn.com/twitter-bootstrap/2.2.1/js/bootstrap.min.js" integrity="sha384-qJ8AGIuPqPo4I2zhyRYO6vQaJrGBbTpIiXGihDsGpfMCHJD0IKH0gkPQToGD5ek3" crossorigin="anonymous"></script>
 
     {% unless page.layout == 'page-no-toc' %}
     <!-- table of contents JS -->