Use pylint 1.3.1 instead of current version.
Use pylint 1.3.1 instead of current version.

Pylint 1.4.0 dropped suppport for Python 2.6. See
https://bitbucket.org/logilab/pylint/issue/390/py26-compatiblity-broken

stefanbirkner/quaidan,stefanbirkner/quaidan,stefanbirkner/quaidan