Nolan Gilley 191fc8f8d4 Change color_RGB_to_xy formula & return brightness (#2095) ...

* Use RGB to XY calculations from Philips Hue developer site

* uppercase X,Y,Z

* rename cx,cy to x,y

* return brightness in color_RGB_to_xy

* remove try/catch

* update existing platforms using color_RGB_to_xy

* improve wemo w/ jaharkes suggestion

* allow brightness override of rgb_to_xy

2016-05-21 10:19:27 -07:00

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