List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-max_ranking&page=904
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "previous": "https://online-go.com/api/v1/tournaments?format=api&ordering=-max_ranking&page=903",
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            "description": "Confused about the new ratings and rank adjustments? Celebrating your new dan/SDK/DDK/TPK status? Join this tournament to test out your new rank in some 9x9 handicap games.",
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                "summary": "A group for people who like tournaments.",
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