Series - Get Categories

http://10.10.10.10:8000/player_api.php?username=userxxxxx&password=passxxxx&action=get_series_categories

[
    {
        category_id: 4,
        category_name: "Series Category 1",
        parent_id: 0
    },
    {
        category_id: 18,
        category_name: "Series Category 2",
        parent_id: 0
    }
]