[master] Update dependencies and adjust code to the new API

[kybarg]

Highlights

1. Updated webpack to version 4
2. Removed webpack-blocks dependency in favor of plain config file
3. Updated babel
4. Dropped support for Node.js 6
5. Removed unused dependencies

Fixes #347, #349

@diegohaz I think using webpack-blocks adds more dependencies and complexity to the part that barely changes during version life cycle, that's why I deleted it, moreover it is not supported enough lately.
if you approve, will work on providing PRs for redux and redux-ssr branches.

[codecov-io]

Codecov Report

Merging #355 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #355   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          43     43           
  Lines         295    297    +2     
  Branches       57     57           
=====================================
+ Hits          295    297    +2

Impacted Files	Coverage Δ
src-example/components/pages/NotFoundPage/index.js	100% <ø> (ø)	⬆️
...-example/components/organisms/FeatureList/index.js	100% <ø> (ø)	⬆️
src-example/components/organisms/Hero/index.js	100% <ø> (ø)	⬆️
src-example/components/pages/SamplePage/index.js	100% <ø> (ø)	⬆️
src-example/components/pages/HomePage/index.js	100% <ø> (ø)	⬆️
src-example/components/organisms/Footer/index.js	100% <ø> (ø)	⬆️
...c-example/components/molecules/IconButton/index.js	100% <100%> (ø)	⬆️
src-example/components/molecules/Slider/index.js	100% <100%> (ø)	⬆️
src-example/components/atoms/Input/index.js	100% <100%> (ø)	⬆️
src-example/components/molecules/IconLink/index.js	100% <100%> (ø)	⬆️
... and 8 more

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[diegohaz]

Thank you so much @kybarg

Only one thing: are all those babel plugins necessary?

[kybarg]

@diegohaz babel since version 7 has broken everything into separate plugins... I guess to be able to drop them easyly when all features are implemented natively

[diegohaz]

Awesome! ✨

[EricWVGG]

Thank you @kybarg, looking forward to the redux-ssr branch.

[Sashkan]

@kybarg Any updates on the portage to redux-ssr ?