Allow importing modules from the `src/` directory example.

1. Foo.js

// Location: src/components/deep/module/foo/Foo.js

import React, { Component} from 'react';

// We want to avoid importing modules relative to the current file
// import Bar from '../../../../bar/Bar.js';

// Instead we want to have a clearer way of importing modules relative to `src/`
import Bar from 'components/bar/Bar.js';

export default class Foo extends Component {
  render() {
    return (
      <div>
        Foo <Bar/>
      </div>
    );
  }
}

2. Bar.js

// Location: src/components/bar/Bar.js

import React, { Component} from 'react';

export default class Bar extends Component {
  render() {
    return <span>Bar</span>;
  }
}