*: add gRPC to build system

Makefile

@@ -1,6 +1,7 @@
 PROJ="poke"
 ORG_PATH="github.com/coreos"
 REPO_PATH="$(ORG_PATH)/$(PROJ)"
+export PATH := $(PWD)/bin:$(PATH)
 
 export GOBIN=$(PWD)/bin
 export GO15VENDOREXPERIMENT=1
@@ -41,15 +42,22 @@ fmt:
 	@go fmt $(shell go list ./... | grep -v '/vendor/')
 
 lint:
-	@for package in $(shell go list ./... | grep -v '/vendor/'); do \
+	@for package in $(shell go list ./... | grep -v '/vendor/' | grep -v 'api/apipb'); do \
       golint $$package; \
 	done
 
+# TODO(ericchiang): Grab protoc as well.
+grpc: bin/protoc-gen-go
+	@protoc --go_out=plugins=grpc:. ./api/apipb/*.proto
+
+bin/protoc-gen-go:
+	@go install ${REPO_PATH}/vendor/github.com/golang/protobuf/protoc-gen-go
+
 clean:
-	rm bin/poke bin/pokectl
+	@rm bin/*
 
 testall: testrace vet fmt lint
 
 FORCE:
 
-.PHONY: test testrace vet fmt lint testall
+.PHONY: test testrace vet fmt lint testall grpc