User Instance
GET /api/users/16/?format=api
{
"username": "Bp",
"gravatar": "//www.gravatar.com/avatar/f64df59b2dcb70048d5db88fb7a47fa1?d=wavatar",
"has_key": false
}GET /api/users/16/?format=api
{
"username": "Bp",
"gravatar": "//www.gravatar.com/avatar/f64df59b2dcb70048d5db88fb7a47fa1?d=wavatar",
"has_key": false
}