added equals and hashcode to BatchMessage
added equals and hashcode to BatchMessage



Former-commit-id: 422d6aeef4a20bebb2610a596d6b864b1e487bdf
phatboyg/MassTransit,MassTransit/MassTransit,SanSYS/MassTransit,MassTransit/MassTransit,jacobpovar/MassTransit,jacobpovar/MassTransit,SanSYS/MassTransit,phatboyg/MassTransit