Add to method saveSong Album,Artist,Genres who are saved to databases
in setUp in song.setName change parametr "nightcore_batman" to
"nightcore-batman"

Change method test to testGetSongByGenre

Add method testGetSongByAlbum, testGetSongByArtist, testLoadSongById
Add Entity adrian.example.musicplayer.model.Music.Album and
adrian.example.musicplayer.model.Music.Artist