Use local JQuery rather than Google hosted version

Author: harding

_includes/_scripts.html

@@ -4,8 +4,7 @@
 <!--<![endif]-->
 </body>
 
-<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
-<script>window.jQuery || document.write('<script src="{{ site.url }}/assets/js/vendor/jquery-1.9.1.min.js"><\/script>')</script>
+<script src="/assets/js/vendor/jquery-1.9.1.min.js"></script>'
 <script src="{{ site.url }}/assets/js/scripts.min.js"></script>
 {% if site.owner.google.analytics %}
 <script>