Fix and pull in brotli encoding (aka Revert "Revert "Add support for brotli encoding"")

[jfhbrook]

Reverts #230

[codecov-io]

Codecov Report

Merging #231 into master will decrease coverage by 0.45%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
- Coverage   75.86%   75.41%   -0.46%     
==========================================
  Files           9        9              
  Lines         518      541      +23     
  Branches      117      125       +8     
==========================================
+ Hits          393      408      +15     
- Misses         45       46       +1     
- Partials       80       87       +7

Impacted Files	Coverage Δ
lib/ecstatic/opts.js	77.96% <66.66%> (-0.3%)	⬇️
lib/ecstatic.js	73.02% <66.66%> (-0.73%)	⬇️

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