added users page that lists all registered users.

this required more js to make the table pretty.

comic/util.py

@@ -16,6 +16,7 @@ class Menu:
         self.menu_items['Account'] = '/comic/account/'
         if user.is_superuser:
             self.menu_items['Settings'] = '/comic/settings/'
+            self.menu_items['Users'] = '/comic/settings/users/'
         self.menu_items['Logout'] = '/logout/'
         self.current_page = page