Add Support for multiple Subscribers per Event

Adds support for:

```
    public static function getSubscribedEvents()
    {
        return array(
            'foo.event'   => array(array('fooAction', 255), array('barAction')),
        );
    }
```

also showing method names in subscriber table...
Update ListenersCommand.php

some minor naming refactorings
Merge pull request #17 from digitalkaoz/patch-1

Add Support for multiple Subscribers per Event