Log Message:
Updated py-cryptography to 1.4.

1.4 - 2016-06-04
~~~~~~~~~~~~~~~~

* Support for OpenSSL 0.9.8 has been removed. Users on older versions of
  OpenSSL will need to upgrade.
* Added :class:`~cryptography.hazmat.primitives.kdf.kbkdf.KBKDFHMAC`.
* Added support for ``OpenSSH`` public key serialization.
* Added support for SHA-2 in RSA
  :class:`~cryptography.hazmat.primitives.asymmetric.padding.OAEP` when using
  OpenSSL 1.0.2 or greater.
* Added "one shot"
  :meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey.sign`
  and
  :meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey.verify`
  methods to RSA keys.