View for listing all Superevents, retrieving individual superevents,
creating new superevents, and updating existing superevents.

GET /api/superevents/
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Cache-Control: must-revalidate, max-age=0, no-cache, no-store
Content-Type: application/json
Expires: Fri, 03 Jul 2020 22:52:06 GMT
Vary: Accept

{
    "numRows": 0,
    "superevents": [],
    "links": {
        "self": "http://gracedb-playground.ligo.org/api/superevents/",
        "next": null,
        "previous": null,
        "first": "http://gracedb-playground.ligo.org/api/superevents/",
        "last": "http://gracedb-playground.ligo.org/api/superevents/?count=10&start=0"
    }
}