User Instance
GET /api/users/354/?format=api
{
"username": "linsfa",
"gravatar": "//www.gravatar.com/avatar/ce500a0efca11aa35597f8ef92d96a7b?d=wavatar",
"has_key": true
}GET /api/users/354/?format=api
{
"username": "linsfa",
"gravatar": "//www.gravatar.com/avatar/ce500a0efca11aa35597f8ef92d96a7b?d=wavatar",
"has_key": true
}