User Instance
GET /api/users/164/?format=api
{
"username": "altf4",
"gravatar": "//www.gravatar.com/avatar/886816f4cfd12f7714027b942cc2cae9?d=wavatar",
"has_key": true
}GET /api/users/164/?format=api
{
"username": "altf4",
"gravatar": "//www.gravatar.com/avatar/886816f4cfd12f7714027b942cc2cae9?d=wavatar",
"has_key": true
}