5.5.1 20170805
* Fix Sonoff Rf Bridge issues
* Add Sonoff RF Bridge MQTT messages on received and learned RF signal
* Add command VoltRes 0|1 to select voltage resolution to 0.1 V (#654)
* Add averaging to Analog input (#686)
* Add Energy tele data on Sonoff Pow Threshold change (#688)
* Fix inconsistent property names in Messages (#690)