- Added assets used by the backend by executing the command
  `php symfony plugin:publish-assets`
  according to `Day 12: The Admin Generator` available at
  http://symfony.com/legacy/doc/jobeet/1_4/en/12?orm=Doctrine
- Added .idea directory (created by PhpStorm) to ignored resources
- Added backend according to `Day 12: The Admin Generator`
  available at
  http://symfony.com/legacy/doc/jobeet/1_4/en/12?orm=Doctrine