[FIX] pep8 line length to 80

activate pep8 check in travis, and add no qa on scenario while waiting improvement of quality-tools.
This is a PEP8 commit only, underling code quality will not be improved in this PR
Please read the first comment :P,

This has already been discussed and is waiting a cleaner solution https://github.com/OCA/maintainer-quality-tools/issues/66.

This change set will should be reverted in a timely manner.

Nicolas