Default strategy for injecting route params into a event

I would like to see the route params are by default injected into a ResourceEvent. Because in my opinion this should be done by default for ALL http methods and every Resource. It's not a performance problem and it would make the factories much easier to write! And less code to maintain. 

```php
class ResourceEvent extends Event
{
    public function setRouteParam($field, $value) {}
    public function getRouteParam($field, $default = null) {}
}
```