Merge pull request #396 from gregquat/2.4

Merging 2.3 in 2.4
Duplicate code exemple

Remove duplicate code exemple
Updating 2.3 with #399
Merge pull request #402 from gregquat/2.3

Updating 2.3 with #399
Merge pull request #403 from symfony-fr/2.3

Updating 2.3 with #399
Merging #403 from 2.3