Possibility turn off associative array for NotORM_Result

`json_encode($notorm->application())` return:

    {
        "1":{"id": "1", ....},
        "2":{"id": "2", ....}
    }

and with `$notorm->assocArray = false` return:

    [
        {"id": "1", ....},
        {"id": "2", ....}
    ]

this is more useful for building rest api application.