add lattice files back in

I think docker-build was failing not because those particular files
weren't there, but because the submodule wasn't being
fetched... giving that a try.

Dockerfile

@@ -7,6 +7,9 @@ ARG GO_VERSION=latest
 FROM moleculacorp/nodejs:latest as lattice-builder
 WORKDIR /lattice
 
+COPY lattice/package.json ./
+COPY lattice/yarn.lock ./
+
 RUN yarn install
 
 COPY lattice ./

Makefile

@@ -195,7 +195,7 @@ generate-proto-grpc: require-protoc require-protoc-gen-go
 generate: generate-protoc generate-statik generate-stringer generate-pql
 
 # Create Docker image from Dockerfile
-docker: vendor
+docker: vendor lattice
 	docker build \
 	    --build-arg GO_VERSION=$(GO_VERSION) \
 	    --tag pilosa:$(VERSION) .