ecdsa: always use signature object
remove crypto hash transition code
fix for hash160 in integration test
Merge pull request #191 from coinpunk/remove-crypto-hash-transistions

Remove crypto hash transistions
Script: add createPubKeyScriptPubKey
README: change fromHex to fromWIF
Merge pull request #188 from dcousens/ecsig

ecdsa: always use signature object