GET /users/:id(\d+)
GET /users/:id(\d+)/visits
POST /users/:id(\d+)
POST /users/new
GET /locations/:id(\d+)
GET /locations/:id(\d+)/avg
POST /locations/:id(\d+)
POST /locations/new
GET /visits/:id(\d+)
POST /visits/:id(\d+)
POST /visits/new
