Add integrity check to inclusion of jquery.min.js and explicitly use https

Author: sgolemon

include/footer.inc

@@ -85,7 +85,7 @@
     ?>
 
  <!-- External and third party libraries. -->
- <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
+ <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" integrity="sha384-aBL3Lzi6c9LNDGvpHkZrrm3ZVsIwohDD7CDozL0pk8FwCrfmV7H9w8j3L7ikEv6h" crossorigin="anonymous"></script>
 <?php
  $jsfiles = array("ext/modernizr.js", "ext/hogan-2.0.0.min.js", "ext/typeahead.min.js", "ext/mousetrap.min.js", "search.js", "common.js");
  foreach ($jsfiles as $filename) {