Add help and packaging to Makefile.

Makefile

@@ -1,5 +1,16 @@
 .PHONY: clean-pyc clean-build docs
 
+help:
+	@echo "clean-build - remove build artifacts"
+	@echo "clean-pyc - remove Python file artifacts"
+	@echo "lint - check style with flake8"
+	@echo "test - run tests quickly with the default Python"
+	@echo "testall - run tests on every Python version with tox"
+	@echo "coverage - check code coverage quickly with the default Python"
+	@echo "docs - generate Sphinx HTML documentation, including API docs"
+	@echo "release - package and upload a release"
+	@echo "sdist - package"
+
 clean: clean-build clean-pyc
 
 clean-build:
@@ -34,3 +45,10 @@ docs:
 	$(MAKE) -C docs clean
 	$(MAKE) -C docs html
 	open docs/_build/html/index.html
+
+release: clean
+	python setup.py sdist upload
+
+sdist: clean
+	python setup.py sdist
+	ls -l dist