ecdsa: use shamirs trick
ecdsa: consistent parameter ordering
ecdsa: use (r, s) values directly
ecdsa: remove ECKey dependency in tests
ecdsa: remove implicit ecparams
ecdsa: use standard declarative notation for functions
ecdsa: fix indentation
sec: use a hashtable for lookup
sec: use BigInteger.fromHex directly
sec: fix formatting
bigi: upgrade to 1.1.0
ECKey: remove unnecessary slice
tests: remove bigi test fixture
tests: use JSON fixtures exclusively