added test to fetch alt_id
added test to fetch alt_id

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