User Instance
GET /api/users/cern-rkusters/?format=api
{
"username": "cern-rkusters",
"first_name": "Roman",
"last_name": "Kusters",
"collections": [],
"visibility": 30
}GET /api/users/cern-rkusters/?format=api
{
"username": "cern-rkusters",
"first_name": "Roman",
"last_name": "Kusters",
"collections": [],
"visibility": 30
}