rename task and Rake::FileList used

railties/lib/rails/tasks/assets.rake

@@ -11,10 +11,10 @@ namespace :assets do
   end
 
   desc "Remove compiled assets"
-  task :cleanup => :environment do
+  task :clean => :environment do
     assets = Rails.application.config.assets
     public_asset_path = Rails.public_path + assets.prefix
-    FileUtils.rm_r Dir.glob("#{public_asset_path}/*.js")
-    FileUtils.rm_r Dir.glob("#{public_asset_path}/*.css")
+    file_list = FileList.new("#{public_asset_path}/*.js", "#{public_asset_path}/*.css")
+    file_list.each{ |list| FileUtils.rm list }
   end
 end