added seq() and length() methods
added seq() and length() methods

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