Infrared support for new LIFX+

[bmv437]

This is in response to Issue #40

Support for getInfrared, setInfrared, stateInfrared packets. maxIR(brightness) and getMaxIR() functions for light objects. unit tests for maxIR() and getMaxIR().

Note: I don't own any LIFX+ bulbs, so I can't actually test that this works yet. If anyone has a LIFX+ bulb, please give this branch a try and report any issues.

[codecov-io]

Current coverage is 57.88% (diff: 59.01%)

Merging #42 into master will increase coverage by 0.05%

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- Misses          528        553    +25   
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[ristomatti]

I received few LIFX+ bulbs and LIFX Z strips yesterday. I tested the code and it appears to be working without any tweaking. Great work @bmv437!

Interestingly I could not find where to set the IR LED brightness in the official Android app. What the app currently does is turn on the IR LED to 100% when the bulb has <10% brightness or when it is toggled off. So with the official app you cannot cucrently turn off the IR LED off in any other means then using a physical switch..

[ristomatti]

I wanted to have this for my own project that uses node-lifx. In the process of getting this and the latest changes in node-lifx combined, I squashed the three commits, fixed merge conflicts and pushed the changes to my fork (https://github.com/ristomatti/node-lifx/tree/feature/infrared_support). If it's of any use I can make a PR from there? The original committer info has been preserved when squashing.

In case someone is interested in testing the IR brightness control it can be done using my interactive CLI lifxsh with some effort (IR feature is only in a dev branch):

git clone git@github.com:ristomatti/lifxsh.git
git checkout ir-brightness
npm install
npm run build
node dist/cli.js

Usage info can be found from the README I just got myself into writing.

[MariusRumpf]

Thanks a lot, merged with help of @ristomatti to develop and just landed in newest release.