Update of LibreOffice Conference Site Add-On

The LibreOffice conference website is driven by the Content Management System (CMS) Plone with a self developed Dexterity type add-on. I’ve reworked this add-on for the Milan conference site a bit.

I meet with a Plone core-developer last weekend and I got some hints to improve the add-on. I committed this improvements to the github-repository today and they are via a rerun of buildout available on the LibreOffice-Milan-Conference-Site now: http://conference.libreoffice.org