Update empty error messages and warn if not viewing the most recent wiki page

app/assets/stylesheets/common.scss

@@ -446,6 +446,19 @@ li.note {
   }
 }
 
+.warning_message {
+  border-left: 4px solid #ed9;
+  color: #b90;
+  padding: 10px;
+  margin-bottom: 10px;
+  background: #ffffe6;
+  padding-left: 20px;
+
+  &.centered {
+    text-align: center;
+  }
+}
+
 .oauth_select_holder {
   padding: 20px;
   img {

app/controllers/wikis_controller.rb

@@ -8,14 +8,13 @@ class WikisController < ProjectResourceController
   end
 
   def show
+    @most_recent_wiki = @project.wikis.where(slug: params[:id]).ordered.first
     if params[:version_id]
       @wiki = @project.wikis.find(params[:version_id])
     else
-      @wiki = @project.wikis.where(slug: params[:id]).ordered.first
+      @wiki = @most_recent_wiki
     end
 
-    @note = @project.notes.new(noteable: @wiki)
-
     if @wiki
       render 'show'
     else

app/views/wikis/empty.html.haml

 %h3.page_title Empty page
 %hr
-.alert-message.block-message.warning
-  %span You are not allowed to create wiki pages
+.error_message
+  You are not allowed to create wiki pages

app/views/wikis/show.html.haml

@@ -10,6 +10,11 @@
         %i.icon-edit
         Edit
 %br
+- if @wiki != @most_recent_wiki
+  .warning_message
+    This is an old version of this page.
+    You can view the #{link_to "most recent version", project_wiki_path(@project, @wiki)} or browse the #{link_to "history", history_project_wiki_path(@project, @wiki)}.
+
 .file_holder
   .file_content.wiki
     = preserve do