Don't go via hex() when working with BNs
add RSA PSS verification support
move PSS to top of docs
make mgf private
consume errors before asserting
cover a missing line for older openssl
extract RSA struct from EVP_PKEY
fix indentation
change rsa nist loader to use strings for algorithm name
pass the hash class rather than using getattr
Merge pull request #759 from public/no-hex

Don't go via hex() when working with BNs
use mgf1_hash_supported to simplify some logic
change exception and improve some language
Merge pull request #768 from reaperhulk/cffi-modulename-fix

Workaround for cffi issue 140
link to Colin Percival re: recommended RSA signature padding
Merge pull request #792 from reaperhulk/rsa-pss-verify

RSA PSS Verify
expand RSA NIST vector loader to support verification vectors as well