wiki: improve history

app/views/wikis/history.html.haml

@@ -9,6 +9,11 @@
     - @wikis.each_with_index do |wiki_page, i|
       %tr
         %td= i + 1
-        %td= link_to wiki_page.created_at.to_s(:short), project_wiki_path(@project, wiki_page, :old_page_id => wiki_page.id)
+        %td
+          = link_to wiki_page.created_at.to_s(:short), project_wiki_path(@project, wiki_page, :old_page_id => wiki_page.id)
+          (
+          = time_ago_in_words(wiki_page.created_at)
+          ago
+          )
         %td= wiki_page.user.name