chore(pkg): eslint 4.7.1, gulp-clean-css 3.9.0, webpack 3.6.0
chore(pkg): eslint 4.7.1, gulp-clean-css 3.9.0, webpack 3.6.0

localnerve/react-pwa-boilerplate,localnerve/react-pwa-reference,localnerve/react-pwa-boilerplate,localnerve/react-pwa-reference