.travis.yml: Upgrade pylint to 1.3.1

Now that https://bitbucket.org/logilab/astroid/issue/42 has been fixed.

I had to add a missing W0703 annotation (Catching too general exception)
that wasn't previously caught by pylint.

Pylint now ignores the "include-ids=yes" config setting, so I've removed
it to silence all the associated warnings. stb-tester developers should
upgrade to pylint 1.3.1.
make check-pylint: Silence libdc1394 warning