Adds SoCo.get_sonos_playlists and MLSonosPlaylist
Added test_mlsonosplaylist
Linting complaints from flake8.
Added travis-ci.org and requires.io status images to README.rst.
Merge pull request #114 from petteraas/get_sonos_playlists

Adds SoCo.get_sonos_playlists and MLSonosPlaylist
fix line-too-long in data_structures.py
Merge pull request #145 from petteraas/badges

Added travis-ci.org and requires.io status images to README.rst.