* Xiaomi Air Purifier 2 integration
* Flake8 errors fixed.
Changes based on review.
* Service domain ("fan") updated and services properly prefixed by xiaomi_miio.
* The underlying library is called python-miio now. Imports and requirements updated.
* Version bumped. The underlying library is called python-miio now.
* rename xiaomi to xiaomi_aqara
* rename xiaomi vacuum and xiaomi phillips light to xiaomi miio
* update discovery and tests
* style
* update discovery and tests
* Still use Philips as name