merge dev_4_4 -D org

Repository: openmicroscopy/ome-documentation
Updating ef59469..2250156
Merged PRs (fast-forward):
  # PR 668 hflynn 'Always link to latest 4 download page'
  # PR 662 hflynn 'Making 4.4 status as maintenance version clear'
  # PR 648 sbesson 'Drop --use-mirrors from .travis.yml (rebased onto dev_4_4)'
  # PR 641 hflynn 'Updating 4.4.x Demo server unavailable now'
  # PR 635 sbesson 'Document latest changes to the Homebrew OMERO formula'
  # PR 631 hflynn 'Changing Windows Ice download link to 3.4'

Generated by OMERO-4.4-merge-daily#489 (http://ci.openmicroscopy.org/job/OMERO-4.4-merge-daily/489/)