Implemented OutputProxy.__eq__() and __hash__().
Implemented OutputProxy.__eq__() and __hash__().

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