Add signing and verifying interfaces
Flesh out EllipticCurveSignatureAlgorithm
Start of EC
Interface tests
Curves should be strings not bytes
Python version compat fixes
Start of SigGen.txt tests
Temporary prints for debugging Travis
ECDSA_SIG to bytes converters
Remove debugging print statements
more s/ECDSA/EllipticCurve/
Signature verification tests that work