User Instance
GET /api/users/15/?format=api
{
"username": "Steak",
"gravatar": "//www.gravatar.com/avatar/d3f1c7e28a033040a90f272658c12f58?d=wavatar",
"has_key": false
}GET /api/users/15/?format=api
{
"username": "Steak",
"gravatar": "//www.gravatar.com/avatar/d3f1c7e28a033040a90f272658c12f58?d=wavatar",
"has_key": false
}