expand rsa bindings
remove RSA PSS constant (for now), de-opaque RSA *
Merge pull request #287 from reaperhulk/rsa-enc-dec-bindings

Expand OpenSSL RSA bindings
Improved the docs -- more glossary entries, more advice for writing docs
Merge pull request #288 from alex/more-docs

Improved the docs -- more glossary entries, more advice for writing docs
add dec2bn
add new error constants
add publickey_dup
Merge pull request #289 from reaperhulk/bunch-o-bindings

Additional OpenSSL bindings