[ZF2] Fixed handling of query parameters

I found a bug that ZF2 module faild to pass query parameters to controller.

----

Case 1:    
- test
```php
$I->amOnPage('/?foo=bar');
```

Case 2:
- html
```html
<form method="POST" action="/?foo=bar">
    <input type="submit" value="Submit" />
</form>
```
 - test
```php
$I->click('Submit');
```

----

In both cases, I got `Array()` by the following code. (expected `Array([foo] => bar)`)
```php
class IndexController extends AbstractActionController
{
    public function indexAction()
    {
        print_r($this->params()->fromQuery());exit;
    }
}
```