[5.5] Support for multiword models to authorize resource controllers

[Hesto]

Not sure if this should be pushed to 5.4 branch or master branch.

Method authorizeResource in framework/src/Illuminate/Foundation/Auth/Access/AuthorizesRequests.php can be used to authorize resource controllers. So if we have model Order and resource controller OrdersController we can use
authorizeResorce(Order::class) method in controller to authorize each REST method with OrderPolicy.

It works fine but if we want to authorize controller for multiword model for example: OrderDetail it will not work. The problem is this code

public function authorizeResource($model, $parameter = null, array $options = [], $request = null)
{
    $parameter = $parameter ?: lcfirst(class_basename($model));
    ...
}

So when the second param is null, it will take model name and change the first letter to lowercase.
For example $parameter for model Order will be order but for model OrderDetail it will be orderDetail.
Unfortunatly this is wrong value because as default laravel params in route model binding are in snake_case not camelCase.
This issue returns always 401 Unauthorized. Of course we can specify the second param maually like so:
authorizeResorce(OrderDetail::class, 'order_detail') but nobody knows about that during implementing ACL feature in his laravel app.

To save time for future users, support for multiword models should be done automatically like so:

public function authorizeResource($model, $parameter = null, array $options = [], $request = null)
{
    $parameter = $parameter ?: snake_case(lcfirst(class_basename($model))); 
    ...
}

Result for models:

• Order -> order (still the same)
• OrderDetail -> order_detail (snake case instead of camel case)

[taylorotwell]

Looks good. Re-targeted to master in case its a breaking change for anyone.

[deleugpn]

Should probably update the title so it doesn't go to the wrong changelog

[Hesto]

@deleugpn title changed