Only serve Javascript to users of IE9 and above

Our Javascript errors in older versions of IE anyway, so we might as
well save people some bandwidth and page load speed by not serving it to
them.

app/templates/admin_template.html

@@ -109,7 +109,9 @@
 {% endblock %}
 
 {% block body_end %}
+  <!--[if gt IE 8]><!-->
   <script type="text/javascript" src="{{ asset_url('javascripts/all.js') }}"></script>
+  <!--<![endif]-->
   <script>
     (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
       (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),