* Make a flatter one level inheritance, with MySensorsLight as parent
with four children, one per light type.
* Break out helper methods. One per plain light, dimmer and RGB/RGBW
children and per update, turn_on and turn_off, nine in total. Put
these in the parent.
* Call the helper methods as needed from the child methods update,
turn_on and turn_off.
* Change name of MySensorsLightLight to MySensorsLightPlain.
* Fix module docstrings according to pep257.
* Change name of color util method from rgb_hex_to_list to
rgb_hex_to_rgb_list.
* Add unit tests for rgb_hex_to_rgb_list.
The package util tests were revised to pull the external library
pyhelloworld3 from an internal source rather than external. This speeds
up tests, makes tests more reliable, and removes dependency on internet
connection.
MartinHjelmare
Paulus Schoutsen
Fabian Affolter
Ryan Kraus
Paulus Schoutsen
Andrew Thigpen