Bug fix patch of the double link list

[asbai]

The pre and next properties of the node separated by the remove method are not correctly set to null. This will cause the linked list to be disrupted when performing operations such as moveToHead.

The fix patch:

	  DoubleLinkedList.prototype.remove = function(node) {
		if (node.pre) {
		  node.pre.next = node.next;
		} else {
		  this.headNode = node.next;
		}
		if (node.next) {
		  node.next.pre = node.pre;
		} else {
		  this.tailNode = node.pre;
		}
		
		node.pre = node.next = null; // <---- Set to null
	  };
  
	  DoubleLinkedList.prototype.insertBeginning = function(node) {
		node.pre = null; // <---- Set to null
		if (this.headNode) {
		  node.next = this.headNode;
		  this.headNode.pre = node;
		  return this.headNode = node;
		} else {
		  return this.headNode = this.tailNode = node;
		}
	  };

[asbai]

Sorry, I confused this project to another :-(