fix(timeouts): fix an obscure cause of firefox timeouts

Fixes #493

Author: juliemr

lib/clientsidescripts.js

@@ -495,7 +495,12 @@ clientSideScripts.findTextareas = function() {
  */
 clientSideScripts.testForAngular = function() {
   var attempts = arguments[0];
-  var callback = arguments[arguments.length - 1];
+  var asyncCallback = arguments[arguments.length - 1];
+  var callback = function(args) {
+    setTimeout(function() {
+      asyncCallback(args);
+    }, 0);
+  };
   var check = function(n) {
     try {
       if (window.angular && window.angular.resumeBootstrap) {