add option to sort import in an alphabetical order

[ozsay]

we use the order rule to group similar imports, which is very useful.

We would love to be able to sort alphabetically inside the groups (sort by the import path):

import fs from 'fs';
import path from 'path';
import crypto from 'crypto'; // fails because it should be before the fs import

import request from 'request';
import _ from 'lodash'; // fails because it should be before the request import

Thanks!

[billyjanitsch]

Duplicate of #389.