Add Demo Mode notifications for self.assert_no_404_errors()
Add Demo Mode notifications for self.assert_no_404_errors()

mdmintz/SeleniumBase,mdmintz/SeleniumBase,mdmintz/SeleniumBase,seleniumbase/SeleniumBase,seleniumbase/SeleniumBase,seleniumbase/SeleniumBase,seleniumbase/SeleniumBase,mdmintz/SeleniumBase