Added return types to the documentation of some methods
Added return types to the documentation of some methods

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