xml and yaml class attributes

phpclass autocomplete on xml and yaml class attributes.
 
by the way we should cleanup the plugin.xml, but not now :)

![xml_class](https://f.cloud.github.com/assets/1011712/483766/34123d6c-b8c8-11e2-88db-db711cf09aa5.png)
![yaml_class](https://f.cloud.github.com/assets/1011712/483767/344845d8-b8c8-11e2-8608-0ac965f75b85.png)