Added $cs->species. Modified $cs->equals to cope with DAS::CoordSystem
Added $cs->species.
Modified $cs->equals to cope with DAS::CoordSystem

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