New image size for "editions" thumbnails
The "visuel_listitem_edition" custom field is now used to add thumbnails to "Edition" objects
New plugin : "Regenerate thumbnails"
We change the image size to fit into the archives blocks
The image is now displayed for everybody
Addition of CSS classes to enhance visual experience
We remove the automatic insertion of paragraphs around the content
New image size for "Edition" banners

Fixes #45