Include commit sha in app.js URL to avoid stale caches

Fixes: #24

resources/templates/home.html

@@ -37,7 +37,7 @@
     }
     var commitethVersion = "{{commitethVersion}}";
 </script>
-{% script "/js/app.js" %}
+<script type="text/javascript" src="/js/app.js?v={{commitethVersion}}"></script>
 <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),