User Instance
GET /api/users/426/?format=api
{
"username": "galoisfield",
"gravatar": "//www.gravatar.com/avatar/92304fb41b707bfb77e03aec07aea3b5?d=wavatar",
"has_key": true
}GET /api/users/426/?format=api
{
"username": "galoisfield",
"gravatar": "//www.gravatar.com/avatar/92304fb41b707bfb77e03aec07aea3b5?d=wavatar",
"has_key": true
}