Add inclusion proof test for an item that exists (#949)
Add inclusion proof test for an item that exists (#949)


Martin2112/trillian,gdbelvin/trillian,gdbelvin/trillian,daviddrysdale/trillian,daviddrysdale/trillian,gdbelvin/trillian,google/trillian,AlCutter/trillian,Martin2112/trillian,google/trillian,AlCutter/trillian,RJPercival/trillian,Martin2112/trillian,daviddrysdale/trillian,RJPercival/trillian