src/node.js
function (key, value) {
  this.left = null;
  this.right = null;
  this.height = null;
  this.key = key;
  this.value = value;
}
function (key, value) {
  this.left = null;
  this.right = null;
  this.height = null;
  this.key = key;
  this.value = value;
}
function ( key , value ) { this . left = null ; this . right = null ; this . height = null ; this . key = key ; this . value = value ; }
Creates a new AVL Tree node.

@private
@param {Object} key The key of the new node.
@param {Object} value The value of the new node.
Creates a new AVL Tree node .