Publish a transpiled version of the Node.js client

This may be needed for React Applications using https://github.com/facebookincubator/create-react-app.

What we want:

• Publish the standard ES6 Node.js version of the client, that could be used with:

  var Nuxeo = require('nuxeo'); // or import Nuxeo from 'nuxeo';
  

• Publish a transpiled to ES5 browser version of the client, that can be installed through bower. This file is located in the dist folder.
• Publish a transpiled to ES5 Node.js version, that could be used with:

  var Nuxeo = require('nuxeo/legacy'); or import Nuxeo from 'nuxeo/legacy';
  

The 2 Node.js versions of the client should also work in a web context, thanks to the browser field in the package.json - for instance in a React Application.

The transpiled Node.js version should work with Node < 6.

Test that we can use the client (with the default or legacy version) with:

• an Angular app
• using https://github.com/facebookincubator/create-react-app
• Node.js >= 6
• Node.js <= 4