Fitbit integration

From Anonymous on 2017/08/29 04:56:36 +0000

Now that the charge 2 and Alta both use heart rate and movement to detect light, deep, and REM sleep I think it would be a beautiful marriage.

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/31077760-fitbit-integration