Add a new attribute to PiccoloCRUD's schema called fields

[dantownsend]

We now have the powerful visible_fields filter in PiccoloCRUD.

It would be nice if a consumer of the API could visit the schema endpoint, and see which fields are available (this would include fields in related tables).

For example:

{
    ...
    "fields": ["id", "name", "director.name", "director.id"],
    ...
}

So they can know which fields they can include in the GET param:

/?__visible_fields=name,director.name

[dantownsend]

Fixed by #114