User Instance
GET /api/users/13/?format=api
{
"username": "Sid",
"gravatar": "//www.gravatar.com/avatar/abf35b5c725f541e73cb60bffd301a67?d=wavatar",
"has_key": false
}GET /api/users/13/?format=api
{
"username": "Sid",
"gravatar": "//www.gravatar.com/avatar/abf35b5c725f541e73cb60bffd301a67?d=wavatar",
"has_key": false
}