Add Elk light platform#17222

Merged

MartinHjelmare merged 6 commits intohome-assistant:devfrom

gwww:elkm1-light

Oct 8, 2018

Commits on Oct 7, 2018

Add Elk light platform.
Glenn Waters
committed
Add ElkM1 light code. Doh.
Glenn Waters
committed

Commits on Oct 8, 2018

Fix PR comments.
Glenn Waters
committed
Fix hound errors.
Glenn Waters
committed
Fix PR comment.
Glenn Waters
committed
Move state from base to class(s) where used
Glenn Waters
committed