Add humidity from MHK2 sensors if available.

[dmcc]

Work towards issue #19

[dlarrick]

Merging this into a local branch for review

[dlarrick]

@dmcc do you have a complete response from the {"c":{"mhk2":{"status":{}}}} query that you're willing to share? Stripped of any sensitive information of course.

[dmcc]

Thanks for taking a look! #19 (comment) is roughly that (slightly different request). I should be able to capture a request for {"c":{"mhk2":{"status":{}}}} this weekend.

Incidentally, I'm confused why the mhk2 entry doesn't include any temperature information since it presumably has that sensor as well, but I guess one thing at a time (LMK if you have ideas on where it may live).

[dlarrick]

Aha! Your comment on #19 is plenty, thanks. If mkh2 unit has a temperature sensor in it maybe it shows up as a normal sensor? Though they could have done that with humidity as well. Who knows...