Store json files.

def store_json(self, filename, dict_to_store):
        """Store json files."""
        epoch = int(time.time() * (10 ** 6))
        s3_key = Key(self.bucket)
        s3_key.key = os.path.join(
            '/data',
            "%s_%s.json" % (filename, epoch)
        )
        s3_key.set_contents_from_string(
            json.dumps(dict_to_store),
            headers={'Content-Type': 'application/json; charset=UTF-8'},
            replace=True
        )