fix: corrected order for chunk.modules

[hulkish]

note: After speaking to Tobias, a sort function will be added in Webpack so we don't need to contend with module internals in the plugin.

• fix: CSS Generated in the wrong order with Webpack 3.0.0

reproducible project https://github.com/cyl19910101/wp3_test

Fixes #548. Is blocked by webpack/webpack#5225

[codecov]

Codecov Report

Merging #563 into feature/webpack3 will increase coverage by 0.37%.
The diff coverage is 100%.

@@                 Coverage Diff                  @@
##           feature/webpack3     #563      +/-   ##
====================================================
+ Coverage             87.37%   87.74%   +0.37%     
====================================================
  Files                     7        7              
  Lines                   301      302       +1     
  Branches                 68       68              
====================================================
+ Hits                    263      265       +2     
+ Misses                   36       35       -1     
  Partials                  2        2

Impacted Files	Coverage Δ
src/index.js	89.7% <100%> (+0.07%)	⬆️
src/loader.js	90.32% <0%> (+1.61%)	⬆️

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[hulkish]

Hmm.. not sure what to do about this https://travis-ci.org/webpack-contrib/extract-text-webpack-plugin/jobs/250950397

[joshwiens]

This fix needs to be based off of and merged into feature/webpack3.

etwp 3.x contains breaking changes that make it webpack 3.x only.

[hulkish]

@d3viant0ne done