Makes the package ready for travis.

Signed-off-by: Markus Hubig <mhubig@gmail.com>
Adapts to the newest version of pylint.

Signed-off-by: Markus Hubig <mhubig@gmail.com>
Adapts to the newest tox.

Signed-off-by: Markus Hubig <mhubig@gmail.com>