GET /
  Lists the bookmarks

  Params:
    format=json|xbel|text|csv|html
    tag={tag} (repeatable)
    limit={limit}
    offset={offset} (only if limit is given)

GET /{id}
  Gets a individual bookmark

GET /{id}/{field}
  Gets an individual field of an individual bookmark

GET /feed
  Gets an Atom feed of the bookmarks

  Params:
    tag={tag} (repeatable)

POST /
  Create or update a bookmark

POST /{id}
  Update a bookmark

== TODO ==

PUT /{id}
  Create or update a bookmark; requires the entire resource representation to be given in JSON or XBEL

DELETE /{id}
  Delete a bookmark

PUT /{id}/{field}
  Set a single field of a bookmark