SAK-22539

Added the isnIdentifier mapping to GenericConverter. JournalConverter
only converts 'journal' types, not 'article' which JOUR gets mapped
to on import, so conversion falls through to GenericConverter.


git-svn-id: https://source.sakaiproject.org/svn/citations/trunk@133955 66ffb92e-73f9-0310-93c1-f5514f145a0a