fix comparator was using ordering strings, not numbers

The old comparator was using the string values of the order attribute
instead of the numeric value, so you would get orders like:
0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

armstrong/core/arm_wells/static/arm_wells/js/well-node-inline.js

@@ -5,7 +5,7 @@ Node = Item.extend({
 NodeList = ItemList.extend({
     model: Node,
     comparator: function(node) {
-        return node.get("order");
+        return +node.get("order");
     }
 });