WIP: Enable override kwalitee configuration

In this WIP you could add a `.kwalitee.yml` file to the root of your project and select which checks you want to make.



``` yaml

# .kwalitee.yml sample

pyflakes: True
pep8: True
pep257: False
ignore:
  # For PEP8 error codes readmore:
  # http://pep8.readthedocs.org/en/latest/intro.html#error-codes
  - 'E101'
  - 'E111'
```

Working repository example https://github.com/drjova/test-kwalitee/pull/7