PyCA cryptography 2.1.2 released

[Paul Kehrer]

PyCA cryptography 2.1.2 has been released to PyPI. cryptography includes
both high level recipes and low level interfaces
to common cryptographic algorithms such as symmetric ciphers, message
digests, and key derivation functions. We support Python 2.7, Python 3.4+,
and PyPy.

Changelog:
* This release corrects a bug with the manylinux1 wheels where OpenSSL's
stack was marked executable.

-Paul Kehrer (reaperhulk)