message: add missing test for Address
Transaction: remove untested (and broken) functionality
ecdsa: add invalid test fixtures for recoverPubKey
ecdsa: amend recoverPubKey SEC comments
ecdsa: add more extensive tests for recoverPubKey
Scripts: move test data to fixtures
scripts: remove unused imports
Transaction: remove untested TransactionIn constructor params
Merge pull request #211 from dcousens/tests

Various tests and recoverPubKey change