versioning is activated by default
add missing interval
added new 'documentation' and 'website' element to documentation
Merge pull request #249 from owncloud/versioning_docu_update

Versioning docu update
Merge pull request #248 from owncloud/infoxml_new_elements

added new 'documentation' and 'website' element to documentation
Merge branch 'master' of https://github.com/owncloud/documentation into stable6