Adapt tests for PHP 5.4

Call-time pass-by-reference is a fatal syntax error in PHP 5.4 and
stdClass objects can't be instantiated automatically anymore.

_test/tests/inc/json.test.php

@@ -276,8 +276,11 @@ class JSON_Object_TestCase extends DokuWikiTest {
 
         $this->obj_j = '{"a_string":"\"he\":llo}:{world","an_array":[1,2,3],"obj":{"a_number":123}}';
 
+        $this->obj1 = new stdClass();
+        $this->obj1->car1 = new stdClass();
         $this->obj1->car1->color = 'tan';
         $this->obj1->car1->model = 'sedan';
+        $this->obj1->car2 = new stdClass();
         $this->obj1->car2->color = 'red';
         $this->obj1->car2->model = 'sports';
         $this->obj1_j = '{"car1":{"color":"tan","model":"sedan"},"car2":{"color":"red","model":"sports"}}';

_test/tests/inc/remote.test.php

@@ -317,7 +317,7 @@ class remote_test extends DokuWikiTest {
 
     function test_pluginCallCustomPath() {
         global $EVENT_HANDLER;
-        $EVENT_HANDLER->register_hook('RPC_CALL_ADD', 'BEFORE', &$this, 'pluginCallCustomPathRegister');
+        $EVENT_HANDLER->register_hook('RPC_CALL_ADD', 'BEFORE', $this, 'pluginCallCustomPathRegister');
 
         $remoteApi = new RemoteAPI();
         $result = $remoteApi->call('custom.path');