List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=players_start&page=4582
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=players_start&page=4581",
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            "name": "FSTS Summer 2016",
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                "username": "DarkSpirit",
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                "name": "Four Seasons Tournament Series",
                "summary": "Серия турниров \"Четыре Сезона\"",
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        {
            "id": 63258,
            "name": "GO Tournament 2",
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                "id": 736685,
                "username": "李朗銳",
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            "description": "Last tournament was a disaster, so we hold this to make things right again!",
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            "group": {
                "id": 5925,
                "name": "Group for GO",
                "summary": "Don't have a group? No problem, just join this group!",
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            "id": 89718,
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                "username": "charlie11",
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            "description": "Well, Im back...",
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                "summary": "A group for Go players who love the 9x9 board.",
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