fix some minor issues found by pycharm code checker

CHANGES.rst

@@ -19,6 +19,7 @@ Other changes:
       # alternatively:
       from nsupdate.settings.prod import *  # for production
       # after that, override whatever you need to override.
+
 * improved docs about a sane settings setup
 * document postgreSQL setup
 * also support Python 2.6.x

nsupdate/main/templates/main/update.html

@@ -38,14 +38,14 @@
     }
 
     function now_str() {
-        dt = new Date();
+        var dt = new Date();
         return format_dt(dt);
     }
 
     function checkIP() {
         $.get("{% url 'myip' %}")
         .done(function( data ) {
-            ip = data;
+            var ip = data;
             $('#myip').text(ip);
             $('#myip_timestamp').text(now_str());
             if(ip != last_ip) {

nsupdate/main/views.py

@@ -463,6 +463,7 @@ def csrf_failure_view(request, reason):
     Django's CSRF middleware's builtin view doesn't tell the user that he needs to have cookies enabled.
 
     :param request: django request object
+    :param reason: why the csrf check failed
     :return: HttpResponse object
     """
     if reason == "CSRF cookie not set.":