add attachemnts support for wall

app/views/layouts/project_resource.html.haml

@@ -40,7 +40,7 @@
             = link_to 'Wiki', project_wiki_path(@project, :home)
 
         - if @project.wall_enabled
-          = nav_link(path: 'projects#wall') do
+          = nav_link(controller: :walls) do
             = link_to 'Wall', project_wall_path(@project)
 
         - if @project.snippets_enabled

app/views/walls/show.html.haml

@@ -3,7 +3,8 @@
   .notes-busy.js-notes-busy
 
   .js-main-target-form
-  = render "notes/form"
+  - if can? current_user, :write_note, @project
+    = render "notes/form"
 
 :javascript
   $(function(){