Update pylint to 1.3.1

This is just to keep us on the upgrade treadmill. ([Changelog](https://bitbucket.org/logilab/pylint/src/9dce395369d32587f2c72c9f128523cfabbd1548/ChangeLog))
This is an exact map. I can add comments with the full code, if you'd prefer, but I find the codes to be confusing.