BusGroup.__getitem__(slice) now returns another BusGroup.
BusGroup.__getitem__(slice) now returns another BusGroup.

andrewyoung1991/supriya,Pulgama/supriya,andrewyoung1991/supriya,andrewyoung1991/supriya,Pulgama/supriya,Pulgama/supriya,josiah-wolf-oberholtzer/supriya,Pulgama/supriya