upgraded deps
upgrade bigi to ^1.1.0
update with new ecurve
add fixture file
removed sha256
brought over tests from BitcoinJS
tests passing with new tests; some skipped for now
tests passing with new module exports method
added deterministicGenerateK(), RFC 6979, See #4
added recoverPubKey() from BitcoinJS
added serializeSigCompact() from BitcoinJS
changed method signature for sign() retained old way for legacy compatibility though
sign() now uses low S value
remove unused getBigRandom()
implemented cleaner verifyRaw from BitcoinJS
cleaner parseSig() from BitcoinJS
renamed calcPubkeyRecoveryParam()
added Testling support