lets give this a try

Makefile

@@ -5,7 +5,7 @@ init:
 test:
 	# This runs all of the tests. To run an individual test, run py.test with
 	# the -k flag, like "py.test -k test_path_is_not_double_encoded"
-	py.test tests
+	python setup.py test
 
 test-readme:
 	python setup.py check -r -s

circle.yml

@@ -0,0 +1,4 @@
+dependencies:
+  override:
+    - pip install tox tox-pyenv
+    - pyenv local 2.6.8 2.7.10 3.3.3 3.4.3 3.5.0 3.6.0