GET /api/
HTTP 200 OK
  Allow: GET, HEAD, OPTIONS
  Content-Type: application/json
  Vary: Accept
  
  {
    "protocol": "http://protocat.org/api/protocol/",
    "profile": "http://protocat.org/api/profile/",
    "category": "http://protocat.org/api/category/",
    "reagent": "http://protocat.org/api/reagent/"
}