User Instance
GET /api/users/125/?format=api
{
"username": "melcar",
"gravatar": "//www.gravatar.com/avatar/2b5d3ca1ae04276c36f58b0d451cfb16?d=wavatar",
"has_key": false
}GET /api/users/125/?format=api
{
"username": "melcar",
"gravatar": "//www.gravatar.com/avatar/2b5d3ca1ae04276c36f58b0d451cfb16?d=wavatar",
"has_key": false
}