Added AnonymousTransformer.

src/Transform/AnonymousTransformer.php

@@ -0,0 +1,19 @@
+<?php
+namespace ScriptFUSION\Porter\Transform;
+
+use ScriptFUSION\Porter\Collection\RecordCollection;
+
+class AnonymousTransformer implements Transformer
+{
+    private $transformer;
+
+    public function __construct(callable $transformer)
+    {
+        $this->transformer = $transformer;
+    }
+
+    public function transform(RecordCollection $records, $context)
+    {
+        return call_user_func($this->transformer, $records, $context);
+    }
+}