Some proposals, driven by common standards

[Odyno]

@gcorne I have added this feature in this PR

• Used the "Best Practices/Architecture Patterns" provided by "Wordpress.org" (https://developer.wordpress.org/plugins/the-basics/best-practices/)
• Used the "React boilerplate" structure (http://www.reactboilerplate.com/)
• Airbnb Eslint Config (https://www.npmjs.com/package/eslint-config-airbnb)
• Inject Server/PHP information in React world
• Hot-mirroring on plugin directory
• BrowserSync with file watch and proxy
• Introduced new NPM rules for: package, pre-start, start and watch
• Libs update