User Instance
GET /api/users/121/?format=api
{
"username": "Imotion",
"gravatar": "//www.gravatar.com/avatar/33d2b5b1f3929fb8ca1c39c43806f0aa?d=wavatar",
"has_key": false
}GET /api/users/121/?format=api
{
"username": "Imotion",
"gravatar": "//www.gravatar.com/avatar/33d2b5b1f3929fb8ca1c39c43806f0aa?d=wavatar",
"has_key": false
}