run pycodestyle in travis

Author: shashank88

.travis.yml

@@ -8,6 +8,8 @@ python:
 services:
    - mongodb
 
+before_install:
+  - pip install pycodestyle
 install:
   - mongo --version
   - pip install --upgrade pip
@@ -31,3 +33,5 @@ install:
 script:
   - pip freeze
   - python setup.py test --pytest-args=-v
+  # Skipped codes in setup.cfg. Tests not checked for now.
+  - pycodestyle arctic

setup.cfg

@@ -0,0 +1,2 @@
+[pycodestyle]
+ignore = E122,E126,E501,E731,W503,E722,W504