Add a gRPC based version of the vmap toy (#122)
Add a gRPC based version of the vmap toy (#122)


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