Would like to have PHPdoc on HelperLocator for IDE

In IDE autocomplete for `HelperLocator` class doesn't have basic helpers like `a`, `base` etc

Would you like to add it there? It could be achieved by adding PHPdoc to `HelperLocator`:

```php
/**
* @method Helper\Anchor a($href, $text, array $attr = array())
*/
```