def instantiate_subclasses(klass)
      klass.descendants.select { |c| !safe || c.safe }.sort.map do |c|
        c.new(config)
      end
    end
def instantiate_subclasses(klass)
      klass.descendants.select { |c| !safe || c.safe }.sort.map do |c|
        c.new(config)
      end
    end
klass - class or module containing the subclasses.
 Returns array of instances of subclasses of parameter.
 Create array of instances of the subclasses of the class or module
 passed in as argument.