Function decode

include/jwt-cpp/jwt.h:4208–4210

	 */
	template<typename json_traits, typename Decode>
	decoded_jwt<json_traits> decode(const typename json_traits::string_type& token, Decode decode) {
		return decoded_jwt<json_traits>(token, decode);
	}

	/**
	 * Decode a token. This can be used to to help access important feild like 'x5c'