TreeNode (Groovy JDK enhancements)

Methods Summary

Methods
Return type	Name and parameters
`TreeNode`	`getAt(int index)` Support the subscript operator for TreeNode.
`Iterator`	`iterator()` Returns an Iterator which traverses the TreeNode one node at a time.
`int`	`size()` Provide the standard Groovy `size()` method for `TreeNode`.

- Methods Detail
  - public TreeNode getAt(int index)
    
    Support the subscript operator for TreeNode.
    
    Parameters:
    
    index - the index of the child node to get
    
    Returns:
    
    the child node at the given index
    
    Since:
    
    1.6.4
  - public Iterator iterator()
    
    Returns an Iterator which traverses the TreeNode one node at a time.
    
    Returns:
    
    an Iterator for a TreeNode
    
    Since:
    
    1.6.4
  - public int size()
    
    Provide the standard Groovy size() method for TreeNode.
    
    Returns:
    
    the child count of the treeNode
    
    Since:
    
    1.6.4