Improvements to Travis CI

.travis.yml

@@ -10,6 +10,12 @@ install:
     - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/test-requirements.txt"
     - "pip install -r requirements.txt"
     - "pip uninstall -y xblock-mentoring && python setup.py sdist && pip install dist/xblock-mentoring-2.0.tar.gz"
-script: python run_tests.py --with-coverage --cover-package=mentoring && pep8 mentoring --max-line-length=120 && pylint mentoring --disable=all --enable=function-redefined,undefined-variable,unused-variable
+script:
+    - pep8 mentoring --max-line-length=120
+    - pylint mentoring --disable=all --enable=function-redefined,undefined-variable,unused-variable
+    - python run_tests.py --with-coverage --cover-package=mentoring
 notifications:
   email: false
+branches:
+    only:
+        - master