Allow passing the resource's version number under "resource" property

https://github.com/Gizra/restful/pull/113/files#r15042743
Nope. We don't have a single resource id inside the plugin definition.

We need to detect `articles__1_6` as being and `articles` resource. Alternative to this:

  1. Force to have a `resource_id` key in the plugin definition (and default to parse out `articles` from `articles__1_6`).
  2. Do something like:

```php
list($detected_name,) = explode('__', $resource['name']);
if ($detected_name != $resource_name) { … }

I like the first one better, declarative programming is less error prone. Which one do you like the most?