revert RefSeqGPFFParser to master branch version

Created by: tgrego

Description

RefSeqGPFFParser has been updated, but WormbaseCElegansRefSeqGPFFParser depends on it and has not been fully updated to be compatible with the changes. Thus RefSeqGPFFParser is being reversed in this branch for merge with master to be possible. The work done on RefSeqGPFFParser is still availabe on the ensembl-xref repo.

Use case

See ENSCORESW-3221

Benefits

Salvage more work from the 2018 xref sprint.

Possible Drawbacks

none I can see

Testing

Have you added/modified unit tests to test the changes? no If so, do the tests pass/fail? yes Have you run the entire test suite and no regression was detected? yes