middleman-*/lib/**/*.rb 
--exclude middleman-core/lib/middleman-core/vendor/
--exclude middleman-core/lib/middleman-core/extensions/automatic_image_sizes/fastimage.rb 
--exclude middleman-more/lib/middleman-more/extensions/minify_css/cssmin.rb 
--exclude middleman-core/lib/middleman-core/step_definitions
--exclude middleman-core/lib/middleman-core/templates/default/
--exclude middleman-core/lib/middleman-core/templates/html5/
--exclude middleman-core/lib/middleman-core/templates/mobile/
--exclude middleman-core/lib/middleman-core/templates/shared/
--no-private
--hide-void-return