get_song_artist() matches correct div
Migrated to Manifest v2
Added license header
Persistant page. Scrobble theshold in SETTINGS.
Updated manifest
Updated version number. Updated extension description.
Merge branch 'google-music' of https://github.com/newgiin/cloudplayer-scrobbler into google-music
Merge pull request #21 from newgiin/google-music

Manifest v2 migration