update versions.yml
Merge pull request #1 from smathot/2.9.1

Update Aix2014 tutorial
Update tutorial

Signed-off-by: lvanderlinden <l.vanderlinden@cogsci.nl>
Signed-off-by: lvanderlinden <l.vanderlinden@cogsci.nl>
Merge branch '2.9.1' into 2.9.0
Update sitemap