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

https://github.com/Gizra/restful/pull/113/files#r15042743
Function signature could be ``getResourceLastVersion($resource_name, $major_version = NULL)``, so one could declare for example:

```php
'main' => array(
+          'name' => 'main',
+          'major_version' => 1,
+        ),
```

(i.e. no minor version -- which will be auto-populated).