Use Async Workers for Heavy Async. Tasks

[daniel-j-h]

This repository is great for getting people up to speed with Node bindings and Nan.

Let's switch over to Nan's AsncWorkers for async. tasks.
It's simpler, clearer and less error prone then doing it ourselves with uv.

Somewhat related: #5.

cc @springmeyer

[daniel-j-h]

Fixed some remaining issues - Linux builds on Travis are green. Waiting for macOS builds (will take a while, will check tomorrow).

[springmeyer]

Thanks for working in this! I'll test on os x later today.

[codecov-io]

Codecov Report

Merging #38 into master will decrease coverage by -0.19%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   98.73%   98.55%   -0.19%     
==========================================
  Files           2        2              
  Lines          79       69      -10     
==========================================
- Hits           78       68      -10     
  Misses          1        1

Impacted Files	Coverage Δ
src/hello_world.hpp	0% <ø> (ø)	✅
src/hello_world.cpp	100% <100%> (ø)	✅

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[daniel-j-h]

Ping - just came across this again by accident, while checking out this project for its node-pre-gyp integration. What's the status here @springmeyer - anything blocking?

[GretaCB]

hey @daniel-j-h 👋 , thanks for getting this PR going! I'm currently refactoring the skel, and going to integrate AsyncWorkers in a new branch coming soon, stay tuned

[daniel-j-h]

Great, thank you! 👍

[GretaCB]

Implemented over at #46