* Add support for Zigbee Home Automation
* Fewer magic numbers
* Make optional device config work
* Remove non-zha device_tracker stuff
* Always return boolean from is_on
* Only pass through JSON serializable discovery_info
* Update to bellows 0.2.4
* Fewer magic numbers in binary sensor
* Populate const structures from a function
* Update bellows to 0.2.6
* Fewer magic numbers in light
* Take all possible clusters when overriding
* Update bellows to 0.2.7
