User Instance
GET /api/users/243/?format=api
{
"username": "Alvenit",
"gravatar": "//www.gravatar.com/avatar/9913d6c2ff8cec00954e1a46fd5efe8f?d=wavatar",
"has_key": false
}GET /api/users/243/?format=api
{
"username": "Alvenit",
"gravatar": "//www.gravatar.com/avatar/9913d6c2ff8cec00954e1a46fd5efe8f?d=wavatar",
"has_key": false
}