Refactor to use node-hue-api

[stephenyeargin]

• Refactors to use node-hue-api package for simplified calls
• Adds light groups to the bridge (rather than use an in-memory hash)
• Adds test coverage to all registered listeners
• Improves output from scripts to no longer spit out raw JSON
• Makes it slightly more polite 😁

Tested with Slack adapter and a hue starter kit.

Fixes #1 by virtue of reducing backtalk to meaningful stuff.

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Edit 1: Adds group note above

[kingbin]

missing json flag

[stephenyeargin]

Fixing this one and a few above it.

[kingbin]

I like what you've done with the project by using node-hue-api. I made a couple suggestions that I saw when skimming through the updates. I was curious for your input. I don't mind accepting the merge request and hopefully getting around to working on those suggestions or allowing you to work on those pieces. I haven't touched this project in a while.
Thanks for your interest! 🍥

[stephenyeargin]

Added some notes.

Biggest addition in this PR may be that it now legitimately adds light groups to the bridge rather than an in-memory solution (that would be lost upon a reset of the Hubot). I don't have any apps (other than this one) that uses that for a particular purpose, but it's handy to be able to say !hue @LivingRoom off.

[kingbin]

I like the direction you went with node-hue-api. I'll work on a dynamic message solution when I get some time unless someone beats me to it. Thanks for your interest in the little project! :)