User Instance
GET /api/users/12/?format=api
{
"username": "Joe",
"gravatar": "//www.gravatar.com/avatar/e175bf662e4a2471ed6f2900cdce6997?d=wavatar",
"has_key": false
}GET /api/users/12/?format=api
{
"username": "Joe",
"gravatar": "//www.gravatar.com/avatar/e175bf662e4a2471ed6f2900cdce6997?d=wavatar",
"has_key": false
}