Add basic DSA backend methods
Remove validation from the backend since it's already done through the API
Add key_size to GC
Add generation methods and remove the optional arguments from the backend
Add tests for DSA parameters and key generation
Add DSABackend
Add docs for DSA parameters and key generation
Merge pull request #739 from skeuomorf/dsa-backend

DSA backend
Bindings for more EC stuff
Some cleanups to imports
pep8, irony
Merge pull request #889 from public/more-ec-bindings

Bindings for more EC stuff
Merge pull request #890 from alex/import-cleanup

Some cleanups to imports
BN_CTX bindings
BN_cmp macro
Merge pull request #891 from public/bn-ctx-binding

BN_CTX bindings
BN_cmp returns an int, not a BIGNUM *
Merge pull request #892 from reaperhulk/bn-fix

BN_cmp returns an int, not a BIGNUM *
Missing comma, whitespace
Replace subclassing of six.with_metaclass with a class decorator