Adding pep8 compliance in travis

.travis.yml

@@ -10,7 +10,7 @@ install:
   - pip install -r requirements-test.txt
   - pip install -q coveralls --use-wheel
 script:
-  - pytest
+  - pytest --pep8
   - if [ "${TRAVIS_PYTHON_VERSION}" != "2.6" ]; then
       pip install bandit;
       bandit -r puppetboard;