User Instance
GET /api/users/448/?format=api
{
"username": "Ukal",
"gravatar": "//www.gravatar.com/avatar/00f7c90a5c334307b5caed3adb5150f3?d=wavatar",
"has_key": false
}GET /api/users/448/?format=api
{
"username": "Ukal",
"gravatar": "//www.gravatar.com/avatar/00f7c90a5c334307b5caed3adb5150f3?d=wavatar",
"has_key": false
}