retrieve:
Return the details about the given Channel id.

list:
List all Channel objects.

GET /api/v1/channels/?offset=500
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "count": 501,
    "next": null,
    "previous": "http://actu.epfl.ch/api/v1/channels/?limit=10&offset=490",
    "results": [
        {
            "id": 618,
            "name": "WR-LAB",
            "fr_description": "Actualité du Laboratoire de recherche sur les bassins versants",
            "en_description": "",
            "de_description": "",
            "is_active": false
        }
    ]
}