add cryptrec and openssl test vector loaders + tests
sort the cryptrec loader dict's items to test reliably
crazy pep8 contortions
simplify and annotate loaders based on review feedback
remove distinction between encrypt/decrypt in the openssl loader

* This was done because all the OpenSSL test vectors we're currently
  using are identical between encrypt/decrypt.
* Removed a bunch of unneeded unit tests that checked the
  encrypt/decrypt vectors
simplify cryptrec loader, improve comments
Merge pull request #71 from reaperhulk/cryptrec-openssl-loader

add cryptrec and openssl test vector loaders + tests