add support for "lightbulbs" connected to Hue

[lobeck]

This is a basic accessory discovering lightbulbs connected to a Hue Bridge and exposes them to HomeKit.

[codecov-io]

Codecov Report

Merging #142 into dev will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #142   +/-   ##
=======================================
  Coverage   52.08%   52.08%           
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  Files          15       15           
  Lines        1342     1342           
  Branches      138      138           
=======================================
  Hits          699      699           
  Misses        628      628           
  Partials       15       15