Binary relocations

[guybedford]

Implements #57 in statically analyzing require('bindings') and require('node-pre-gyp').find loads and handling them as asset relocations.

Cases supported:

• import binary from 'node-pre-gyp'; binary.find(__dirname + 'package.json') (plus import * variant)
• require('bindings')('asdf')
• var bindings = require('bindings'); bindings('asdf')

This should be merged with the other PRs, so will rebase depending on what order the merges happen.

Because of the issue with architecture matching, I originally wanted to enable this specifically behind a "binary" flag, but since the default case is then effectively for binaries just not to work, I've left this out for now.

[guybedford]

Fixes #33.

[codecov-io]

Codecov Report

Merging #93 into master will increase coverage by 2.24%.
The diff coverage is 82.71%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   67.54%   69.78%   +2.24%     
==========================================
  Files           3        3              
  Lines         265      331      +66     
==========================================
+ Hits          179      231      +52     
- Misses         86      100      +14

Impacted Files	Coverage Δ
src/asset-relocator.js	92.22% <82.71%> (-6.99%)	⬇️

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