Cosmetics.
display UrlMap action buttons on repository write

If someone has write access on the repository he/she
can edit/add UrlMaps.
Only show user for recently updated ontologies on home#show, if it is present. Fixes #464.
Merge pull request #551 from ontohub/550-adjust_accessrights_for_url_maps

display UrlMap action buttons on repository write
Merge branch 'staging' into 549-updating-ontohub-icon