Fix backward compatibility with upload API

Author: Jamie Snape

core/controllers/api/SystemController.php

@@ -91,6 +91,24 @@ public function postAction()
         );
     }
 
+    /**
+     * The put action handles PUT requests and receives an 'id' parameter; it
+     * should update the server resource state of the resource identified by
+     * the 'id' value.
+     */
+    public function putAction()
+    {
+        $apiFunctions = array(
+            'upload' => 'uploadPerform',
+        );
+        $this->_genericAction(
+            $this->_request->getParams(),
+            $this->_request->getControllerName(),
+            'put',
+            $apiFunctions
+        );
+    }
+
     /**
      * The options action handles OPTIONS requests; it should respond with
      * the HTTP methods that the server supports for specified URL.