Merge pull request #67 from mcartaud/master

implement text flow for the download page
Add sitemap.xml (see https://github.com/restlet/restlet-marketing/issues/127)
Merge pull request #68 from mcartaud/master

update css style for maven text flow
Google Webmaster Tools metatag integration (see https://github.com/restlet/restlet-marketing/issues/114)
Add the Google WebMaster Tools metatag (see https://github.com/restlet/restlet-marketing/issues/114)
modify css in order to improve code snipet rendering
report modification for past releases - https://github.com/restlet/restlet-marketing/issues/115