Switched to using the jquery-dragster library to implement more consistent drag and drop support, rather than using the inconsistent html5 implementation

web/templates/head.html

@@ -32,6 +32,8 @@
 
     <script src="/static/js/perfect-scrollbar-0.6.3.jquery.js"></script>
 
+    <script src="/static/js/jquery-dragster/jquery.dragster.js"></script>
+
     <script type="text/javascript" src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1','packages':['annotationchart']}]}"></script>
 
     <script type="text/javascript" src="https://cloudfront.loggly.com/js/loggly.tracker.js" async></script>