User Instance
GET /api/users/188/?format=api
{
"username": "Tarzan",
"gravatar": "//www.gravatar.com/avatar/6b1baa708d2a80320b77f2f27030b38f?d=wavatar",
"has_key": false
}GET /api/users/188/?format=api
{
"username": "Tarzan",
"gravatar": "//www.gravatar.com/avatar/6b1baa708d2a80320b77f2f27030b38f?d=wavatar",
"has_key": false
}