Merge pull request #740 from hflynn/rebased/develop/insight-contrib

Updating insight contributing file (rebased onto develop)
Remove Ubuntu versions which aren't supported by upstream
merge develop -D org: PR 741 (Remove Ubuntu versions which aren't supported by upstream (rebased onto develop))
merge develop -D org

Repository: openmicroscopy/ome-documentation
Updating 0d779bb..54672e8
Merged PRs (fast-forward):
  # PR 740 hflynn 'Updating insight contributing file (rebased onto develop)'

Merged PRs:
  # PR 741 hflynn 'Remove Ubuntu versions which aren't supported by upstream (rebased onto develop)'

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