* Avoid None comparison for zwave cover.
* Just rely on unit from config for unit_of_measurement
* Explicit return None
* Mqtt (#11)
* Explicit return None
* Missing service and wrong service name defined
* Mqtt state was inverted, and never triggering
* First draft for cover component
* Efficiency from @martinhjelmare
* migrate demo
* migrate demo test
* migrate command_line rollershutter
* migrate command_line test
* migrate rpi_gpio garage_door
* make some abstract methods optional
* migrate homematic
* migrate scsgate
* migrate rfxtrx and test
* migrate zwave
* migrate wink
* migrate mqtt rollershutter and test
* requirements
* coverage
* Update mqtt with garage door
* Naming and cleanup
* update test_demo.py
* update demo and core
* Add deprecated warning to rollershutter and garage_door
* Naming again
* Update
* String constants
* Make sure set_position works properly in demo too
* Make sure position is not set if not available.
* Naming, and is_closed
* Update zwave.py
* requirements
* Update test_rfxtrx.py
* fix mqtt
* requirements
* fix wink version
* Fixed demo test
* naming
John Arild Berentsen