Change script to treat mnemonic as normal form.
whitespace
Fix input index bounds check.
Update test to match script encoding change.
Add signle input test for input-sign command.
Simplify unit test, add comments.
Fix index bounds check.
Add unit test.
Add input-validate test (failing).
Fiddle with some text and parameter names.
Merge pull request #62 from evoskuil/develop

Add tests and modify script primitive.
Harden script primitive against deserializer sentinel return.
Fix test vector for input-validate, rename args, update text and comments.
Fix typo
Comments
Rename sighash parameter to signature_type.
Add coverage and update tests.
Rename signhash parameter to signature_type.
Handle generate_signature_hash() error sentinel.
Fix help typo.