thumbor-expire

Add timeout verification for thumbor

Use

• Server side

thumbor config file set URL_SIGNER = thumbor_expire.base64_hmac_sha1_expire

• Client side

use from thumbor_expire.crypto import CryptoURL class and pass expire argument, accept type :obj:int | :obj:float | :obj:datetime.timedelta | \ :obj:datetime.datetime | :obj:datetime.time, optional