Provide more complete example default data in Resources.php

When an API call includes a param of a custom class, the default value provided for Swagger includes that custom class as an empty string. This patch provides a skeleton object that matches the needed param.

In the Restler "Author" example (http://restler3.luracast.com/param.html#param-and--var), Explorer would include this default JSON object which validates as invalid at submission:
```
{
    "author" : ""
}
```

This patch changes the default JSON object to the following:
```
{
    "author": {
        "name": null,
        "email": null
    }
}
```