User Instance
GET /api/users/9/?format=api
{
"username": "cynddl",
"gravatar": "//www.gravatar.com/avatar/1ab3a230f4d3e5c5ac343ac63b91aafd?d=wavatar",
"has_key": false
}GET /api/users/9/?format=api
{
"username": "cynddl",
"gravatar": "//www.gravatar.com/avatar/1ab3a230f4d3e5c5ac343ac63b91aafd?d=wavatar",
"has_key": false
}