Implement add-on actions and events.

[mrstegeman]

Fixes #717

[mrstegeman]

This is going to fail on Travis CI until the following PR is merged: WebThingsIO/gateway-addon-node#4

[hobinjk]

This is great to have and LGTM, nice work!

[codecov-io]

Codecov Report

Merging #806 into master will decrease coverage by 0.55%.
The diff coverage is 76.96%.

@@            Coverage Diff             @@
##           master     #806      +/-   ##
==========================================
- Coverage   78.79%   78.23%   -0.56%     
==========================================
  Files          85       87       +2     
  Lines        3466     3570     +104     
  Branches      455      470      +15     
==========================================
+ Hits         2731     2793      +62     
- Misses        675      710      +35     
- Partials       60       67       +7

Impacted Files	Coverage Δ
src/rules-engine/effects/ActionEffect.js	90.47% <ø> (ø)	⬆️
src/plugin/plugin.js	76.38% <0%> (-4.5%)	⬇️
src/addons-test/mock-adapter/mock-adapter.js	91.93% <100%> (+0.55%)	⬆️
src/controllers/actions_controller.js	100% <100%> (ø)	⬆️
src/router.js	97.91% <100%> (+0.04%)	⬆️
src/constants.js	100% <100%> (ø)	⬆️
src/controllers/things_controller.js	93.18% <100%> (+0.21%)	⬆️
src/models/thing.js	96.36% <100%> (+1.81%)	⬆️
src/models/events.js	23.07% <23.07%> (ø)
src/plugin/addon-manager-proxy.js	71.81% <46.66%> (-3.98%)	⬇️
... and 9 more

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[hobinjk]

It would be nice to have a test of actions and events through mock-adapter but that can be left to future work if you'd prefer.

[mrstegeman]

@hobinjk We should definitely do that. The actions, things, and rules engine tests already test the actions interface pretty thoroughly, and the rules engine tests events, but it would be good to expand that a bit.