Code review comment for lp:~rick-fdd/pyopenssl/crl_and_revoked

I spent a good chunk of time on this today. Some changes have been necessary, primarily to improve test coverage, but also to get the code working on Windows. I haven't finished looking at all the code yet. You can find my changes in <lp:~exarkun/pyopenssl/crl_and_revoked>.

One thing which I probably won't undertake, but which might make sense, is for the Revoked class to be a Python class, not an extension class. This would greatly simplify the implementation, and I don't think it would introduce any problems, since the only thing Revoked instances are used for configuring CRLs (that is, they aren't passed directly into any other OpenSSL APIs) and because their identity is already discarded when they pass through a CRL object. However, I'm definitely not familiar with all of OpenSSL's CRL-related APIs.