clean (Multiruby)

    # File lib/multiruby.rb, line 127
      def self.clean
        self.each_scm_build_dir do |style|
          case style
          when :svn, :git then
            if File.exist? "Rakefile" then
              run "rake clean"
            elsif File.exist? "Makefile" then
              run "make clean"
            end
          else
            FileUtils.rm_rf Dir.pwd
          end
        end
      end