Return the list of public data files.

GET /api/public-data/?created_start=2/14/2016&created_end=2/14/2016&source=direct-sharing-139
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Thu, 23 May 2019 18:52:03 GMT
Vary: Accept

{
    "count": 0,
    "next": null,
    "previous": null,
    "results": []
}