Log Message:
Updated py-cryptography to 1.5.

1.5 - 2016-08-26
~~~~~~~~~~~~~~~~

* Added
  \ 
:func:`~cryptography.hazmat.primitives.asymmetric.padding.calculate_max_pss_salt \ 
_length`.
* Added "one shot"
  :meth:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey.sign`
  and
  :meth:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey.verify`
  methods to DSA keys.
* Added "one shot"
  :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey.sign`
  and
  :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.verify`
  methods to ECDSA keys.
* Switched back to the older callback model on Python 3.5 in order to mitigate
  the locking callback problem with OpenSSL <1.1.0.
* :class:`~cryptography.x509.CertificateBuilder`,
  :class:`~cryptography.x509.CertificateRevocationListBuilder`, and
  :class:`~cryptography.x509.RevokedCertificateBuilder` now accept timezone
  aware ``datetime`` objects as method arguments
* ``cryptography`` now supports OpenSSL 1.1.0 as a compilation target.