- BC Break: _PHP_ namespaces changed (PSR-4 standard). The _root_ namespace for all _PF_ related scripts is Exodus4D\Pathfinder

- BC Break: Project folder structure changed. Removed `app/main` dir.
- BC Break: Core _PHP_ framework + dependencies moved into `composer.json` and are no longer part of this repo

app/Data/Mapper/SortingIterator.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Exodus 4D
+ * Date: 24.12.2018
+ * Time: 00:55
+ */
+
+namespace Exodus4D\Pathfinder\Data\Mapper;
+
+
+class SortingIterator extends \ArrayIterator {
+
+    public function __construct(\Traversable $iterator, callable $callback){
+        parent::__construct(iterator_to_array($iterator));
+
+        // sort by custom function
+        $this->uasort($callback);
+    }
+}