consolidate dsa serialization loading tests and improve verifier
parametrize some more serialization tests
Merge pull request #1568 from reaperhulk/consolidate-even-more

parametrize some more serialization tests
Merge pull request #1567 from reaperhulk/consolidate-more

consolidate dsa serialization loading tests and improve verifier
add pypy3 to build matrix

excluding on linux until the ubuntu ppa has it
also exclude 0.9.8 pypy3 on linux for now
add a comment explaining why we're excluding pypy3 on linux
don't do coverage under pypy3
Combined duplicated serialization tests
Merge pull request #1571 from reaperhulk/add-pypy3

add pypy3 to build matrix
Merge pull request #1572 from alex/delete-duplicate

Combined duplicated serialization tests
Support for traditional OpenSSL and PKCS8 RSA private key serialization

This temporarily uses the backend to do it until the alternate approach
is ready. DSA/ECDSA and public key support will follow.
review feedback fixes