Merge branch 'cache-project-row' into 'master'

Cache project row on dashboard, group and user page

See merge request !1639

app/views/shared/_project.html.haml

-= link_to project_path(project), class: dom_class(project) do
+= cache [project, controller.controller_name, controller.action_name] do
+  = link_to project_path(project), class: dom_class(project) do
     - if avatar
       .dash-project-avatar
         = project_icon(project, alt: '', class: 'avatar project-avatar s40')