User Instance
GET /api/users/260/?format=api
{
"username": "Thibault",
"gravatar": "//www.gravatar.com/avatar/f0dc38126fe2d8d5879d0ac264512a4b?d=wavatar",
"has_key": true
}GET /api/users/260/?format=api
{
"username": "Thibault",
"gravatar": "//www.gravatar.com/avatar/f0dc38126fe2d8d5879d0ac264512a4b?d=wavatar",
"has_key": true
}