FIX: deliver discourse stylesheets over cdn

lib/sass/discourse_stylesheets.rb

@@ -23,7 +23,7 @@ class DiscourseStylesheets
       builder = self.new(target)
       builder.compile unless File.exists?(builder.stylesheet_fullpath)
       builder.ensure_digestless_file
-      tag = %[<link href="#{Rails.env.production? ? builder.stylesheet_relpath : builder.stylesheet_relpath_no_digest + '?body=1'}" media="all" rel="stylesheet" />]
+      tag = %[<link href="#{Rails.env.production? ? builder.stylesheet_cdnpath : builder.stylesheet_relpath_no_digest + '?body=1'}" media="all" rel="stylesheet" />]
 
       cache[target] = tag
 
@@ -110,9 +110,14 @@ class DiscourseStylesheets
     "#{cache_fullpath}/#{stylesheet_filename_no_digest}"
   end
 
+  def stylesheet_cdnpath
+    "#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws#{Discourse.current_hostname}"
+  end
+
   def stylesheet_relpath
     "/#{CACHE_PATH}/#{stylesheet_filename}"
   end
+
   def stylesheet_relpath_no_digest
     "/#{CACHE_PATH}/#{stylesheet_filename_no_digest}"
   end