Fix import path (#12)

Author: alexshtin

Makefile

@@ -32,11 +32,11 @@ grpc: gogo-grpc
 
 gogo-grpc: clean $(PROTO_OUT)
 	echo "Compiling for gogo-gRPC..."
-	$(foreach PROTO_DIR,$(PROTO_DIRS),protoc --proto_path=$(PROTO_IMPORT) --gogoslick_out=Mgoogle/protobuf/wrappers.proto=github.com/gogo/protobuf/types,Mgoogle/protobuf/timestamp.proto=github.com/gogo/protobuf/types,plugins=grpc,paths=source_relative:$(PROTO_OUT) $(PROTO_DIR)*.proto;)
+	$(foreach PROTO_DIR,$(PROTO_DIRS),protoc --proto_path=$(PROTO_IMPORT) --gogoslick_out=Mprotobuf/google/protobuf/wrappers.proto=github.com/gogo/protobuf/types,Mprotobuf/google/protobuf/timestamp.proto=github.com/gogo/protobuf/types,plugins=grpc,paths=source_relative:$(PROTO_OUT) $(PROTO_DIR)*.proto;)
 
 gogo-protobuf: clean $(PROTO_OUT)
 	echo "Compiling for gogo-protobuf..."
-	$(foreach PROTO_DIR,$(PROTO_DIRS),protoc --proto_path=$(PROTO_IMPORT) --gogoslick_out=Mgoogle/protobuf/wrappers.proto=github.com/gogo/protobuf/types,Mgoogle/protobuf/timestamp.proto=github.com/gogo/protobuf/types,paths=source_relative:$(PROTO_OUT) $(PROTO_DIR)*.proto;)
+	$(foreach PROTO_DIR,$(PROTO_DIRS),protoc --proto_path=$(PROTO_IMPORT) --gogoslick_out=Mprotobuf/google/protobuf/wrappers.proto=github.com/gogo/protobuf/types,Mprotobuf/google/protobuf/timestamp.proto=github.com/gogo/protobuf/types,paths=source_relative:$(PROTO_OUT) $(PROTO_DIR)*.proto;)
 
 go-protobuf: clean $(PROTO_OUT)
 	echo "Compiling for go-protobuf..."