pyopenssl

Merge pull request #58 from exarkun/universal-wheel

add a wheel install step and make the script build the wheel so this functionality is at least minimally exercised.

pyOpenSSL is now pure python -- it can be a universal wheel

Merge pull request #52 from pyca/setup.py-py3-classifier

add Python :: 2 and some comments referring to reasons to include Python :: 3 here