Binary require support

[guybedford]

This implements the simple case of (3) in #57.

Thanks @TooTallNate for the suggestions on this one - was exactly as you described and using a similar approach to node-native-loader.

[guybedford]

This also fixes another bug where asset name deduping was not being shared between modules, which should resolve #65.

[codecov-io]

Codecov Report

Merging #85 into master will decrease coverage by 1.24%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
- Coverage   70.85%   69.61%   -1.25%     
==========================================
  Files           4        5       +1     
  Lines         326      283      -43     
==========================================
- Hits          231      197      -34     
+ Misses         95       86       -9

Impacted Files	Coverage Δ
src/loaders/relocate-loader.js	99.19% <100%> (ø)
src/loaders/node-loader.js	100% <100%> (ø)
src/utils/dedupe-names.js	100% <100%> (ø)
src/index.js	91.52% <100%> (+0.14%)	⬆️
src/cli.js	0% <0%> (ø)	⬆️
src/sourcemap-register.js

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[rauchg]

@guybedford has conflicts

[guybedford]

Rebased.