Prevent indexing of old versions of a page (fixes #768)

lib/gollum/app.rb

@@ -386,6 +386,7 @@ module Precious
         @page = page
         @name = name
         @content = page.formatted_data
+        @version = version
         mustache :page
       else
         halt 404

lib/gollum/templates/layout.mustache

@@ -7,6 +7,7 @@
   <link rel="stylesheet" type="text/css" href="{{base_url}}/css/dialog.css" media="all">
   <link rel="stylesheet" type="text/css" href="{{base_url}}/css/template.css" media="all">
   {{#css}}<link rel="stylesheet" type="text/css" href="{{base_url}}/custom.css" media="all">{{/css}}
+  {{#noindex}}<meta name="robots" content="noindex, nofollow" />{{/noindex}}
 
   <!--[if IE 7]>
   <link rel="stylesheet" type="text/css" href="{{base_url}}/css/ie7.css" media="all">

lib/gollum/views/page.rb

@@ -35,6 +35,10 @@ module Precious
         first.authored_date.strftime(DATE_FORMAT)
       end
 
+      def noindex
+        @version ? true : false
+      end
+
       def editable
         @editable
       end