allow more than one file per parser
allow more than one file per parser

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