Get the config.

        :rtype: dict

def _get_config(self, path=None):
        """
        Get the config.

        :rtype: dict
        """
        if not path and not self.option("config"):
            raise Exception("The --config|-c option is missing.")

        if not path:
            path = self.option("config")

        filename, ext = os.path.splitext(path)
        if ext in [".yml", ".yaml"]:
            with open(path) as fd:
                config = yaml.load(fd)
        elif ext in [".py"]:
            config = {}

            with open(path) as fh:
                exec(fh.read(), {}, config)
        else:
            raise RuntimeError("Config file [%s] is not supported." % path)

        return config