Foreground service
implemented wake locks
Messages to static methods ported
fix bug with current playlist
does't exit from settings + fixed #2, #3, #4, Aleksey's bugs
Merge branch 'ForegroundService' of https://github.com/technoparkGroup/VKAudio into ForegroundService
onSongCompletion bug fix
playerView don't show downloadBtn when playing from saved songs
closes #8
Merge branch 'ForegroundService' of https://github.com/technoparkGroup/VKAudio into ForegroundService
closes #9