Add make setup command

Makefile

@@ -3,10 +3,15 @@ SHELL := /bin/bash
 help:
 	@echo "usage:"
 	@echo "    make release -- build and release to PyPI"
+	@echo "    make setup   -- set up for local dev"
 	@echo "    make test    -- run the tests"
 
 release:
 	python setup.py register sdist bdist_wheel upload
 
+setup:
+	pip install -e .
+	pip install -r requirements.txt
+
 test:
 	tox