deposit: duplicate validator with prod inspirehep

One issue, but it's not a problem of the validator itself, rather our import logic: on import, even if there are some validation errors, the id is imported.

depends on: https://github.com/inspirehep/invenio/pull/115
Yes, that is a mistake, it should go back to ```'e.g. 10.1234/foo.bar or doi:10.1234/foo.bar'```