added Inventory-Model and modified the ResponseTransformer-Model so that it would use the new Inventory-Model in appropriate cases

Author: David Albrecht

lib/Discogs/Model/Inventory.php

@@ -0,0 +1,47 @@
+<?php
+/*
+* This file is part of the DiscogsAPI PHP SDK.
+*
+* (c) Richard van den Brand <richard@vandenbrand.org>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+ 
+namespace Discogs\Model;
+ 
+class Inventory implements \Countable, \IteratorAggregate
+{
+    protected $pagination;
+    protected $listings;
+ 
+    public function setPagination($pagination)
+    {
+        $this->pagination = $pagination;
+    }
+ 
+    public function getPagination()
+    {
+        return $this->pagination;
+    }
+ 
+    public function setListings($listings)
+    {
+        $this->listings = $listings;
+    }
+ 
+    public function getListings()
+    {
+        return $this->listings;
+    }
+ 
+    public function count()
+    {
+        return $this->getPagination()->getItems();
+    }
+ 
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->listings);
+    }
+}

lib/Discogs/ResponseTransformer/Model.php

@@ -140,6 +140,8 @@ protected function getClass($path)
             $key = 'resultset';
         } else if (preg_match('#^/(artists|releases|masters|labels)/#i', $path, $matches)) {
             $key = $this->getSingular($matches[1]);
+        } else if (preg_match('#^/users/[\d\w_-]+/inventory#i', $path, $matches)) {
+            $key = 'inventory';
         } else {
             $key = '';
         }