* Add a component for GreenEye Monitor
[GreenEye Monitor](http://www.brultech.com/greeneye/) is an energy
monitor that can monitor emergy usage of individual circuits, count pulses
from things like water or gas meters, and monitor temperatures. This component
exposes these various sensors in Home Assistant, for both data tracking and
automation triggering purposes.
* Consolidate sensors
* lint
* .coveragerc
* - cv.ensure_list
- DOMAIN, where appropriate
- defaults to schema
- single invocation of async_load_platform
- async_create_task instead of async_add_job
- fail if no sensors
- monitors required
- async_add_entities
- call add_devices once
- remove unused schema
- use properties rather than set fields
- move _number and unique_id to GEMSensor
- remove unnecessary get(xxx, None)
- keep params on one line when possible
- new-style string format
* Fix `ensure_list` usage, log message
* Pass config through
Jonathan Keljo