phpDocumentor/phpDocumentor2 — pull request #493 by joncave (2012-06-07 19:26:46+00:00)
Title: Interface inheritance

Currently interface inheritance doesn't work correctly. Parsing a file containing an interface that extends another produces the following error:

```
PHP Notice: Array to string conversion in InterfaceReflector.php on line 51
```

This is because interfaces can do multiple inheritance so `$this->node->extends` is an array for interfaces.

The changes here allow for (multiple) interface inheritance. Class specific behaviour is also pulled out of the interface exporter; interfaces cannot implement anything and they don't have parent classes.