Add a basic Makefile that builds all the conda packages for us

Makefile

+all: ${HOME}/miniconda3 ${HOME}/miniconda3/envs/data metadata build
+
+${HOME}/miniconda3:
+	@echo Please install miniconda to ${HOME}/miniconda3
+	@exit 1
+
+${HOME}/miniconda3/envs/data: environment.yml
+	conda env update
+	touch $@
+
+.PHONY: metadata
+metadata:
+	buildout parts=gen_metadata
+
+.PHONY: build
+build:
+	pushd metadata; for package in *; do conda build $${package}; done; popd