apply redesigned MR list to dashboard, group etc

app/views/shared/_merge_requests.html.haml

@@ -4,7 +4,7 @@
       - project = group[0]
       %h5.title
         = link_to_project project
-      %ul.well-list
+      %ul.well-list.mr-list
         - group[1].each do |merge_request|
           = render(partial: 'merge_requests/merge_request', locals: {merge_request: merge_request})
   %hr