GitLab

- Current regex works for dev, master and semvers
- It doesn't work for issue branches

Adapter implementations can override receivedInvalid
to log or report on messages that don't pass validation

I've raised an issue to confirm the schema loads from a
tag once we have created a release to test against.

Take tag/branch/commitref as constructor arg
and retrieve schema from gitlab

+ use response from implicit auth in get auth header

+ refactor cucumber step functions into test folder
+ rename features after tested adapter methods
+ refactor adapter.validate to call adapter.protocol.validate

Add test to check that the mock schema is valid
If the mock schema is not valid then invalid messages
can be marked as valid which makes the tests ineffective

Implement rollup to build importable modules