Better lifecycle for MQTT client

Things were failing when starting the Manager with no connection (e.g. during a systemd service on startup).

Now the library should handle those scenarios in a more resilient way.

v0.2.0

The Light component is now supported by this library.

You can find a simple example of a dimmable light in the examples folder.

First release

Version 0.1.0. Lots of things to do. Just checking the package on PyPI and that gears are turning 😄