When run directly (rather than from BaseParser), now correctly gets source_id from filename.
When run directly (rather than from BaseParser), now correctly gets source_id from filename.

mjg17/ensembl,muffato/ensembl,danstaines/ensembl,Ensembl/ensembl,danstaines/ensembl,at7/ensembl,muffato/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,mjg17/ensembl,Ensembl/ensembl,willmclaren/ensembl,muffato/ensembl,at7/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,at7/ensembl,at7/ensembl,willmclaren/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,muffato/ensembl