added method fetch_all allows to fetch all density features without for all slices also takes an optional logic_name argument
added method fetch_all
allows to fetch all density features without for all slices
also takes an optional logic_name argument

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