Add a stripped-down Makefile and a .gitignore

.gitignore

+build/
+node_modules/

Makefile

+NPM_BIN := $(shell npm bin)
+
+.PHONY: default
+default: all
+
+.PHONY: all
+all: build/manifest.json
+
+## Remove build artifacts
+.PHONY: clean
+clean:
+	rm -f node_modules/.uptodate
+	rm -rf build
+
+## Run test suite
+.PHONY: test
+test: node_modules/.uptodate
+	$(NPM_BIN)/gulp test-app
+
+################################################################################
+
+build/manifest.json: node_modules/.uptodate
+	$(NPM_BIN)/gulp build-app
+
+node_modules/.uptodate: package.json
+	@echo installing javascript dependencies
+	@$(NPM_BIN)/check-dependencies 2>/dev/null || npm install
+	@touch $@