function toggleShufflePlaylist(playlist) {
    /*
      If the playlist shuffled is on, we toggle it off. If the
      playlist shuffled is off, we toggle it on.
    */
    if (_config2.default.playlists[playlist].shuffle) {
      _config2.default.playlists[playlist].shuffle = false;
      _config2.default.playlists[playlist].shuffle_list = [];
    } else {
      _config2.default.playlists[playlist].shuffle = true;
      shufflePlaylistSongs(playlist);
    }
  }
Sets the shuffle state for a playlist

@access public
@param {string} playlist   The key of the playlist we are shuffling.