This will nack all pebble health datalog messages. As mentioned in #322, this would allow to use multiple android device without secondary devices "sipping" the health data from the watch.
This message was previously treated as a further "Sleep" message type, with firmware version 3.12 further types were added that are clearly unrelated to sleep (possibly to high-intensity activities like running etc.), hence the related code is now moved to a separate class.
The only decoded records are still sleep-related.
Fixes#312
Andreas Shimokawa