Set devServer.publicPath to use output.publicPath

[eliperelman]

Fixes #175.

[codecov]

Codecov Report

Merging #177 into master will increase coverage by 3.46%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
+ Coverage   90.69%   94.15%   +3.46%     
==========================================
  Files          36       36              
  Lines         419      445      +26     
==========================================
+ Hits          380      419      +39     
+ Misses         39       26      -13

Impacted Files	Coverage Δ
packages/neutrino-preset-web/index.js	97.61% <ø> (+16.66%)	⬆️
packages/neutrino-preset-react/test/react_test.js	100% <100%> (ø)	⬆️
packages/neutrino-preset-node/test/node_test.js	100% <100%> (ø)	⬆️
packages/neutrino-preset-web/test/web_test.js	100% <100%> (ø)	⬆️
packages/neutrino-preset-react/index.js	90% <0%> (+10%)	⬆️
packages/neutrino-preset-node/index.js	93.54% <0%> (+16.12%)	⬆️

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