Notify when spinner was refreshed
Fixed - task 373: [bug] change widget fallback to boot 
https://github.com/asksven/BetterBatteryStats/issues/issue/373
Fixed - task 374: [bug] Refreshing spinners and explicit user refresh
reads through the cache 
https://github.com/asksven/BetterBatteryStats/issues/issue/374
Commit for release