Fix for nested data objects when loading table with a promise

[dtychshenko]

As the title states, this is a fix for nested data objects when loading a table though a promise. Ex:

Options:

vm.dtOptions = DTOptionsBuilder.fromFnPromise(function() {
        return $resource('data-nested.json').get().$promise;
    }).withPaginationType('full_numbers')
      .withDataProp('data.inner');

data-nested.json:

{
    "data": {
        "inner": [
            {
                "id": 860,
                "firstName": "Superman",
                "lastName": "Yoda"
            }, {
                "id": 870,
                "firstName": "Foo",
                "lastName": "Whateveryournameis"
            }, {
                "id": 590,
                "firstName": "Toto",
                "lastName": "Titi"
            }
        ]
    }
}

[l-lin]

Awesome 👍