make the $self->new syntax work with feature pair
make the $self->new syntax work with feature pair

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