expand pkcs1 loader to load PKCS1 v1.5 and PSS signature examples
fix rsa key loader test
fix pep8
rename msg -> message in pkcs1 loader
Merge pull request #636 from reaperhulk/rsa-signature-loader

Expand PKCS1 loader to load PKCS1 v1.5 and PSS signature examples
Explicitly pass the key parameters instead of using **kwargs.  Now we don't have to pop some stuff.
Merge pull request #641 from dreid/explicit-passing-of-key-parameters

Explicitly pass the key parameters instead of using **kwargs.
a few more methods from x509.h for OpenSSL
Merge pull request #642 from reaperhulk/x509-get-default-cert-dir

Bind more x509.h functions for OpenSSL
expand pkcs1 loader to load PKCS1 v1.5 and PSS signature examples
sign/verify
add docs
add padding
a bunch of PKCS1/PSS tests + todos
updates to match the interfaces that landed
hexlify things less stupidly