visibility level info in project tabs

app/views/dashboard/_project.html.haml

 = link_to project_path(project), class: dom_class(project) do
+  = visibility_level_icon(project.visibility_level)
   %span.namespace-name
     - if project.namespace
       = project.namespace.human_name

app/views/groups/_projects.html.haml

@@ -12,6 +12,7 @@
     - projects.each do |project|
       %li.project-row
         = link_to project_path(project), class: dom_class(project) do
+          = visibility_level_icon(project.visibility_level)
           %span.project-name
             = truncate(project.name, length: 25)
           %span.arrow