Add pylint to travis

.travis.yml

@@ -3,8 +3,8 @@ python:
   - "3.4"
 install:
   - pip install -r requirements.txt
-  - pip install pep8
+  - pip install pep8 pylint
 script:
   - pep8 homeassistant --exclude bower_components,external
+  - pylint homeassistant
   - python -m homeassistant -t test
-

pylintrc

 [MASTER]
 ignore=external
+reports=no
 
-disable=locally-disabled,duplicate-code
+# Reasons disabled:
+# locally-disabled - it spams too much
+# duplicate-code - unavoidable
+# cyclic-import - doesn't test if both import on load
+disable=locally-disabled,duplicate-code,cyclic-import
 
 [EXCEPTIONS]
 overgeneral-exceptions=Exception,HomeAssistantError