Simple React ES6 Extractify example

Showing off extractify with simple react and es6 example. Details in examples/react_es6/README.md

Minor release to add index.jsx into extensions list

Minor release to add index.jsx into extensions list.

Major refactoring required to work with actual proxy

WHAT

To utilize main browserify's enties, plugins, options, etc.. thru actual proxy method in lazy browserifies, this major refactoring was required. This is especially necessary to use the plugins registered in main bundle in lazy bundles.

HOW

• Refactor main flow and separate action function into extractify prototype
• Remove extractify plugin in lazy bundles to prevent looping
• Updated eslint rules
• Extra making external steps in lazyBundle