Added get_Genes_by_type method for use in GeneBuild code.
Added get_Genes_by_type method for use in GeneBuild code.

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