Nbind binary support

[guybedford]

This provides nbind binary asset emission support (just like we do for node-gyp and bindings).

Fixes #132 supporting yoga-layout.

[codecov-io]

Codecov Report

Merging #220 into master will increase coverage by 1.07%.
The diff coverage is 88.63%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   68.84%   69.92%   +1.07%     
==========================================
  Files          13       13              
  Lines         597      635      +38     
==========================================
+ Hits          411      444      +33     
- Misses        186      191       +5

Impacted Files	Coverage Δ
src/cli.js	0% <ø> (ø)	⬆️
src/loaders/relocate-loader.js	92.33% <88.63%> (-0.8%)	⬇️

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