integrate #138 [close #137]
integrate #138 [close #137]

tanhaiwang/gmusicapi,simon-weber/gmusicapi,dvirtz/gmusicapi,simon-weber/Unofficial-Google-Music-API,TheOpenDevProject/gmusicapi,peetahzee/Unofficial-Google-Music-API,dvirtz/gmusicapi,nvbn/Unofficial-Google-Music-API,thebigmunch/gmusicapi