Enable removing genre auto-playlists from the list

- Added an svg "X" icon to enable removing auto-playlists
- Notice that the background-color and color change are done too, and since it's SVG, it takes only one image and some CSS to do both.
- Added a subsonic.css file. It is intended (long term) to have all subsonic view-related CSS styles.
- persistence-service now manages the selected genre auto-playlists names instead of utils.getValue().
- Rewrote persistence-service.js to comply with https://github.com/johnpapa/angular-styleguide#style-y052
- Rewrote many test descriptions in persistence-service_test.js to follow these recommendations : http://gojko.net/2015/02/25/how-to-get-the-most-out-of-given-when-then/

app/common/main-controller.js

@@ -6,8 +6,6 @@ angular.module('JamStash')
     $rootScope.settings = globals.settings;
     $rootScope.song = [];
     $rootScope.playingSong = null;
-    $rootScope.MusicFolders = [];
-    $rootScope.Genres = [];
     $rootScope.Messages = [];
 
     $rootScope.unity = null;
@@ -56,7 +54,6 @@ angular.module('JamStash')
         }
         if (utils.getValue("SavedCollections")) { globals.SavedCollections = utils.getValue("SavedCollections").split(","); }
         if (utils.getValue("DefaultCollection")) { globals.DefaultCollection = utils.getValue("DefaultCollection"); }
-        if (utils.getValue("SavedGenres")) { globals.SavedGenres = utils.getValue("SavedGenres").split(","); }
         if (globals.settings.Debug) { console.log('Loaded Settings: ' + JSON.stringify(globals.settings, null, 2)); }
     };
     $scope.toggleSetting = function (setting) {