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))
It was moved further down in the file. I made this new file by running ``pylint --generate-rcfile`` and then customizing the generated file to match the settings in our existing file.