Add mutations observer to initialize user initials added through ajax

app/assets/javascripts/users.js

@@ -2,7 +2,14 @@
   "use strict";
   App.Users = {
     initialize: function() {
+      var observer;
       $(".initialjs-avatar").initial();
+      observer = new MutationObserver(function(mutations) {
+        $.each(mutations, function(index, mutation) {
+          $(mutation.addedNodes).find(".initialjs-avatar").initial();
+        });
+      });
+      observer.observe(document.body, { childList: true, subtree: true });
     }
   };
 }).call(this);