Add get_all_by_exon_stable_id method
Add get_all_by_exon_stable_id method

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