Check Python style using Travis CI

Author: ligurio

.travis.yml

@@ -0,0 +1,20 @@
+language: "python"
+
+python:
+   - "2.7"
+   - "3.3"
+   - "3.4"
+   - "3.5"
+   - "pypy"
+   - "pypy3"
+
+install:
+   - pip install flake8
+
+script:
+   - flake8 --ignore=W191,F401,E501 .
+
+notifications:
+  email:
+    on_success: change
+    on_failure: always