Fix #2002 Tag::linkTo() to allow the addition of query string parameters

See https://github.com/phalcon/cphalcon/issues/2002
```php
echo Phalcon\Tag::linkTo(array('signup/register', 'Register Here!', 'query' => array('a' => 1, 'b' => 2)))
```
```output
<a href="/signup/register?a=1&b2">Register Here!</a>
```