# ==== Parameters
    # file<String>:: The file to reload.
    def reload(file)
      remove_classes_in_file(file) { |f| load_file(f) }
    end

    # Reload the router to regenerate all routes.
    def reload_router!
      if File.file?(router_file = Merb.dir_for(:router) / Merb.glob_for(:router))
        Merb::Router.reset!
        reload router_file
      end
    end

    # ==== Parameters
    # file<String>:: The file to remove classes for.
    # &block:: A block to call with the file that has been removed.
    def remove_classes_in_file(file, &block)
      Merb.klass_hashes.each {|x| x.protect_keys!}
      if klasses = LOADED_CLASSES.delete(file)
        klasses.each { |klass| remove_constant(klass) unless klass.to_s =~ /Router/ }
      end
      yield file if block_given?
      Merb.klass_hashes.each {|x| x.unprotect_keys!}
    end