Merge pull request #62 from dohaben1/master

Implémentation de la méthode RemoveSong + corrections d'erreurs islocal ...
Comment + getSong
squeleton of the SongSearcher class
Merge pull request #64 from amina196/master

[music] squeleton of the SongSearcher class
Comment v2 + getSong v2 + Grade (Constructor)
Merge pull request #65 from Levleyth/master

[Music]Comment v2 + getSong v2 + Grade (Constructor)
 [MUSIC] ApiMusic definition function
Merge pull request #66 from RymBarkaoui/master

 [MUSIC] ApiMusic definition function
{Music} Implémentation Squelette ApiMusicImpl