More CRL related bindings
More CRL related bindings

Some of those are needed to implement pyca/pyopenssl#181, others are just
for having a complete useful set.

Might be a nice fit for the new X509Extension work, as the extensions for
CRLs and Revoked objects have the same type.

bwhmather/cryptography,Ayrx/cryptography,Ayrx/cryptography,Hasimir/cryptography,sholsapp/cryptography,sholsapp/cryptography,skeuomorf/cryptography,Hasimir/cryptography,bwhmather/cryptography,kimvais/cryptography,bwhmather/cryptography,skeuomorf/cryptography,Hasimir/cryptography,kimvais/cryptography,sholsapp/cryptography,Ayrx/cryptography,skeuomorf/cryptography,bwhmather/cryptography,Ayrx/cryptography,kimvais/cryptography,skeuomorf/cryptography,kimvais/cryptography,sholsapp/cryptography,Hasimir/cryptography