NOTES:
  - About iterator Policy/Questions:
      - should Iterator policy determine how it traverses the tree?
  - should policy determine how the items are inserted into the trees children?
  - should removal which causes re adjustment of the tree should something like that
 cause the tree to remove all nodes under that node or shift a particular node to be the parent?
 - Child iterator for iterating over an array.
 !! about child nodes !!
      - should a child node know what position its in with in a child array?
          - the advantage to doing something like this would be that if the
 index was set to -1 then that could mean the root.
      Policy behavior possibilities:
             when defreferencing a nodes children
          - skip null children
          - exception on null children
          - Crash/segmentation fault on null children.

          - can policy determine the behavior of my iterator?
        -ex say i want a const iterator could a policy make something a const_iterator

thoughts: something like that might help with template metaprogramming because if an iterator
would contain that policy then the compiler should know to pick a particular function and functionality
of a class based on that.


TODO: High level over view/ List of tasks and issues
 - Make an iterator class
 - find an implementation of a tree which has a good implementation and documentation.
      - Make that find a binary tree because the Red Black tree in the stl is ugly
  and hard to read
  - Move assign and copy assign operators for both the node class and the n_ary_tree class
  - remove all and singular removal.
  - Is empty function
  - add_child(index, value)   - policy stuff required for either at or just []
  - add_sibling(index, value) - policy stuff required for either at or just []
  - ~node and ~n_ary_tree need to be added.
  - begin and end where do they go?( Which nodes )

Note Concepts required of type T
  - needs to be copy constructable and all of the concepts related to that.



Iterator questions and notes:
    - should the iterator have access to return items which are with in the array of children?


removal of sub trees.