Replaced piwik with google analytics (ssl certificate missing on the server), then deleted google analytics and also the sitemap submitted to google webmaster tools.

Launch of the site, version 0.9.
Added sitemap for being consumable on google, implemented some small fixes.

Validation of the site with W3C's tools. Small fixes all around. General list of things to refactor in the next review (e.g. better css class name and automatic vendor prefixes).