updates to the pytest tests to fix the issues with pwm, added 2 new tests that bring in 5 total unit tests. python3 unit tests are passing, this will close #42 and close #47

Makefile

@@ -1,10 +1,16 @@
+# PyPi Packaging
 package: clean
+	@echo " ** PACKAGING FOR PYPI **"
 	python setup.py sdist
 
+# PyPi Publishing
 publish: package
+	@echo " ** UPLOADING TO PYPI **"
 	twine upload dist/*
 
+# Clean all the things
 clean:
+	@echo " ** CLEANING CHIP_IO **"
 	rm -rf CHIP_IO.* build dist
 	rm -f *.pyo *.pyc
 	rm -f *.egg
@@ -12,14 +18,43 @@ clean:
 	rm -rf debian/python-chip-io*
 	rm -rf debian/python3-chip-io*
 
-tests:
-	py.test
+# Run all the tests
+tests: pytest2 pytest3
 
+# Run the tests with Python 2
+pytest2:
+	@echo " ** RUNING CHIP_IO TESTS UNDER PYTHON 2 **"
+	pushd test; python -m pytest; popd
+
+# Run the tests with Python 3
+pytest3:
+	@echo " ** RUNING CHIP_IO TESTS UNDER PYTHON 3 **"
+	pushd test; python3 -m pytest; popd
+
+# Build all the things
 build:
+	@echo " ** BUILDING CHIP_IO: PYTHON 2 **"
 	python setup.py build --force
 
+# Install all the things
 install: build
+	@echo " ** INSTALLING CHIP_IO: PYTHON 2 **"
 	python setup.py install --force
 
+# Build for Python 3
+build3:
+	@echo " ** BUILDING CHIP_IO: PYTHON 3 **"
+	python3 setup.py build --force
+
+# Install for Python 3
+install3: build3
+	@echo " ** INSTALLING CHIP_IO: PYTHON 3 **"
+	python3 setup.py install --force
+
+# Install for both Python 2 and 3
+all: install install3
+
+# Create a deb file
 debfile:
+	@echo " ** BUILDING DEBIAN PACKAGES **"
 	dpkg-buildpackage -rfakeroot -uc -b