* Improve build speed by using cheap source maps and dropping eslint loader.
* use old 'source-map' on dev when SLOW_BUILD_SPEED env variable exists
* Increase build speed further via caching and DLL
* Cleanup code
* Add step to readme
* Move DLL loader to dev instead of base
* Add post install script
* Revert readme change
* ignore dll dir
HenryNguyen5