gihp does not work with PHP 5.3

```
PHP Fatal error:  Call to undefined method ReflectionClass::newInstanceWithoutConstructor() in /home/travis/builds/vierbergenlars/gihp/lib/gihp/Defer/Object.php on line 167
```
https://travis-ci.org/vierbergenlars/gihp/jobs/4251131

`ReflectionClass::newInstanceWithoutConstructor()` does not exist until PHP 5.4
Try using `ReflectionClass::newInstance()` to inject the dependencies (constructor is never called in usercode anyways