code: public RedwoodConfiguration handler(final LogRecordHandler parent, final LogRecordHandler child){
      tasks.add(new Runnable() { public void run() { Redwood.appendHandler(parent, child);} });
      return this;
    }
docs: Add a handler to as a child of an existing parent
  @param parent The handler to extend
  @param child The new handler to add
  @return this