[WIP] Support multiple @find-by annotations

Still open tasks but basic support for multiple ```@find-by```. Still requiring some new unit tests and ```ElementCollection``` see #48 for more details.

Closes #13
Indeed, missed that yesterday. I just thought of getting the collection directly by Iterator but `getObject` is the far better solution.

```php
	$collection = $this->getObject();
	$collection->setContainer($this->getContainer());
```