Added babel-polyfill from babel-core 6.1.18

web/templates/head.html

@@ -38,6 +38,7 @@
     <script src="/static/js/react-bootstrap-0.28.1.js"></script>
     <script src="/static/js/perfect-scrollbar-0.6.7.jquery.min.js"></script>
     <script src="/static/js/jquery-dragster/jquery.dragster.js"></script>
+    <script src="/static/js/babel-polyfill-6.1.18.min.js"></script>
     <script src="/static/js/katex.min.js"></script>
 
     <style id="antiClickjack">body{display:none !important;}</style>