Match sprockets language

clean is used to remove only old assets, clobber is to remove all

Author: dhh

lib/tasks/cssbundling/clean.rake renamed to lib/tasks/cssbundling/clobber.rake

@@ -1,8 +1,6 @@
 namespace :css do
   desc "Remove CSS builds"
-  task :clean do
+  task :clobber do
     rm_rf Dir["app/assets/builds/[^.]*.css"], verbose: false
   end
 end
-
-Rake::Task["assets:clean"].enhance(["css:clean"])