def <<(text)
         if !last.nil? and last.respond_to?(:text=)
            last.append(text)
         else
            self.store(TextNode.new(self, text))
         end
      end
def <<(text)
         if !last.nil? and last.respond_to?(:text=)
            last.append(text)
         else
            self.store(TextNode.new(self, text))
         end
      end
This is the constructor for the CommandNode class.

 ==== Parameters
 parent::  A reference to the node that owns the new node.
 prefix::  A String containing the prefix text for the command.
 suffix::  A String containing the suffix text for the command. Defaults
           to nil.
 split::   A boolean to indicate whether the prefix and suffix should
           be written to separate lines whether the node is converted
           to RTF. Defaults to true.
 wrap::    A boolean to indicate whether the prefix and suffix should
           be wrapped in curly braces. Defaults to true.
 This method adds text to a command node. If the last child node of the
 target node is a TextNode then the text is appended to that. Otherwise
 a new TextNode is created and append to the node.

 ==== Parameters
 text::  The String of text to be written to the node.