Deceptively simple commit message. This is a massive change that completely reworks the most fundamental part of the API. Not only does it remove the push logging, it also restructures logging to give better insight into what happens during an API call.
This was happening because I was calling die() in an API call...which preemptively killed the script. The API didn't set some variables and everything broke. Better not to die() anyways so that stuff actually gets logged.
Turns out ecobee is sometimes changing firstConnected (on four thermostats so far, see #203). Since this field is no longer reliable, switching to serial number (identifier) only.
