Main loop daemon.

def loop(self):
        """Main loop daemon."""
        while True:
            sleep(1)
            new_file_list = self.walk(self.file_path, {})
            if new_file_list != self.file_list:
                if self.debug:
                    self.diff_list(new_file_list, self.file_list)
                self.run_tests()
                self.file_list = new_file_list