Merge pull request #2 from koloszko/php7-incompatibility-issue

In PHP7 indirect expressions interpratation has been changed - syntax…

Manager/UploaderManager.php

@@ -299,7 +299,7 @@ public function handleUpload($entity, $requestId=null, $options = array())
 
         foreach ($data as $property) {
             $context = $property['mapping'];
-            $mediaEntities = $entity->$property['nameGetFunction']();
+            $mediaEntities = $entity->{$property['nameGetFunction']}();
 
             $this->removeMarkedMedia($context, $requestId);
             $this->renameMarkedMedia($context, $requestId);