Add blueprint button style

app/views/layouts/admin.html.erb

@@ -5,7 +5,7 @@
   <title>R4</title>
   <link rel="shortcut icon" href="/favicon.ico">
   <%= yield :page_specific_link %>
-  <%= stylesheet_link_tag "blueprint/screen", "forms", "main", :media => "screen, projection" %>
+  <%= stylesheet_link_tag "blueprint/screen", "blueprint/plugins/buttons/screen", "forms", "main", :media => "screen, projection" %>
   <%= stylesheet_link_tag "blueprint/print", :media => "print" %>
   <!--[if IE]>
     <%= stylesheet_link_tag "blueprint/ie", :media => "screen, projection" %>