User Instance
GET /api/users/409/?format=api
{
"username": "F2Ville",
"gravatar": "//www.gravatar.com/avatar/898c4d3cbdf60eecb51ad08183251ddb?d=wavatar",
"has_key": true
}GET /api/users/409/?format=api
{
"username": "F2Ville",
"gravatar": "//www.gravatar.com/avatar/898c4d3cbdf60eecb51ad08183251ddb?d=wavatar",
"has_key": true
}