* move is_off property to SmartDevice, implement is_on for bulb and use it
* refactor by moving smartbulb and smartplug to their own classes
* drop python2 compatibility, make flake8 happy
* travis: remove 2.7, add 3.6
* Add new client tool
After installing the package pyhs100 command-line tool can be used
to control the plug.
See --help for its usage, most of the features for plugs are implemented,
some of the shared functionality works for bulbs too.
* Add discover command
* Delete old examples, the cli works as an example well enough
