cmd/serve: add --chainid as flag and ENV CHAIN_ID to command
cmd/serve: add --chainid as flag and ENV CHAIN_ID to command

eris-ltd/eris-db,benjaminbollen/eris-db,benjaminbollen/eris-db,benjaminbollen/burrow,silasdavis/burrow,benjaminbollen/burrow,silasdavis/burrow,silasdavis/burrow,eris-ltd/eris-db