Change Travis CI build to use setup.py for testing.

Author: brotskydotcom

.travis.yml

@@ -4,6 +4,7 @@ python:
   - 3.4
   - 3.5
 install:
+  - pip install --upgrade pip setuptools wheel
   - pip install -r requirements.txt
 script:
-  - pytest
+  - python setup.py test

requirements.txt

@@ -8,3 +8,5 @@ enum34
 pytest
 mock
 PyYAML
+# setup.py testing
+pytest-runner