Implemented rating system for song, album and artist (album and artist do not retrieve rating from server)

app/src/main/java/com/cappielloantonio/play/subsonic/models/SubsonicResponse.java

@@ -56,6 +56,7 @@ public class SubsonicResponse {
     private NowPlaying nowPlaying;
     private VideoInfo videoInfo;
     private Videos videos;
+    @Element(name = "song")
     private Child song;
     @Element(name = "album")
     private AlbumWithSongsID3 album;