reload! (Rack::Reloader)

    # File lib/rack/reloader.rb, line 28
        def reload!(stderr=STDERR)
          need_reload = $LOADED_FEATURES.find_all { |loaded|
            begin
              if loaded =~ /\A[.\/]/  # absolute filename or 1.9
                abs = loaded
              else
                abs = $LOAD_PATH.map { |path| ::File.join(path, loaded) }.
                                 find { |file| ::File.exist? file }
              end

              if abs
                ::File.mtime(abs) > @last - @secs  rescue false
              else
                false
              end
            end
          }

          need_reload.each { |l|
            $LOADED_FEATURES.delete l
          }

          need_reload.each { |to_load|
            begin
              if require to_load
                stderr.puts "#{self.class}: reloaded `#{to_load}'"
              end
            rescue LoadError, SyntaxError => e
              raise e                 # Possibly ShowExceptions
            end
          }

          stderr.flush
          need_reload
        end