Add Magicseaweed API support#15132

Merged

MartinHjelmare merged 12 commits intohome-assistant:devfrom

jcconnell:magicseaweed-sensor

Jul 27, 2018

Commits on Jun 24, 2018

Commits on Jun 25, 2018

Commits on Jul 8, 2018

Commits on Jul 12, 2018

Incorporate @balloob requested changes.
jcconnell
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