Merge pull request #19 from PrestaEdit/2.3.0

2.3.0
Update README.md
Merge pull request #20 from PrestaEdit/development

[*] Version: 2.3.1
Update README.md
[-] Fix: rends les css et js "overridable" dans les themes
Merge pull request #25 from goof03/themeoverrides

Themeoverrides Dev