remove automatic redirect on 401 responses for periodical ajax calls

this change will now no longer redirect on timed out sessions, but also won't spuriously redirect on backend timeouts
explicit session timeouts will need some api client changes for cleaner exception handling

fixes #695

public/javascripts/periodicals.js

@@ -11,13 +11,6 @@ $(window).focus(function(){
 
 
 $(document).ready(function() {
-    $.ajaxSetup({
-        statusCode: {
-            401: function() {
-                window.location.href = "/"; // TODO use router!
-            }
-        }
-    });
     // Total event counts;
     (function updateTotalEvents() {
         if ($(".total-events").length > 0) {