User Instance
GET /api/users/19/?format=api
{
"username": "Staz",
"gravatar": "//www.gravatar.com/avatar/19def78c661967a6cd8b6bc379b27ba1?d=wavatar",
"has_key": false
}GET /api/users/19/?format=api
{
"username": "Staz",
"gravatar": "//www.gravatar.com/avatar/19def78c661967a6cd8b6bc379b27ba1?d=wavatar",
"has_key": false
}