Create the setCustomHydrationMode function

This allows multiple hydrators to be set at once, and also allows for
the customHydrationMode options to be set via DoctrineORMModule

lib/Doctrine/ORM/Configuration.php

@@ -512,6 +512,20 @@ public function setCustomDatetimeFunctions(array $functions)
         }
     }
 
+    /**
+     * Set the custom hydrator modes in one pass.
+     *
+     * @param array An array of ($modeName => $hydrator)
+     */
+    public function setCustomHydrationModes($modes)
+    {
+        $this->_attributes['customHydrationMods'] = array();
+
+        foreach ($modes as $modeName => $hydrator) {
+            $this->addCustomHydrationMode($modeName, $hydrator);
+        }
+    }
+
     /**
      * Get the hydrator class for the given hydration mode name.
      *