Merge branch 'ui_improvements_for_events_table' into 'master'

Ui improvements for events table

UI improvements as per comments by @dzaporozhets in https://dev.gitlab.org/gitlab/gitlab-ee/merge_requests/250

See merge request !256

app/views/audit_events/_event_table.html.haml

@@ -2,28 +2,18 @@
   %table.table#audits
     %thead
       %tr
-        %th
-        %th
         %th Author
-        %th
-        %th
         %th Action
-        %th
         %th Target
-        %th
         %th At
 
     %tbody
       - events.each do |event|
         %tr
-          %td
-          %td
           %td #{event.author_name}
           %td
-          %td
-          %td #{raw human_text(event.details)}
-          %td
+            %span
+              #{raw human_text(event.details)}
           %td #{event.details[:target_details]}
-          %td
           %td #{event.created_at}
-      = paginate events
+  = paginate events, theme: "gitlab"