PR for #683

@DavertMik Don't merge this yet. I'm not sure about one thing:

```html
<a href="/info">More info</a>
```
```php
$this->module->seeLink('More info', '/');
```
Should this pass or fail? Now it passes because '/info' contains '/'. If it is supposed to fail, I have to modify the XPath selector. And either way I need to add a test for it.