Restconf GET operations functionality are not supported yet

Expected behavior:

Request
-------
GET /restconf/operations HTTP/1.1
Host: example.com
Accept: application/yang.api+json

Response
--------
HTTP/1.1 200 OK
Date: Mon, 23 Apr 2012 17:01:00 GMT
Server: example-server
Cache-Control: no-cache
Pragma: no-cache
Last-Modified: Sun, 22 Apr 2012 01:00:14 GMT
Content-Type: application/yang.api+json

{ "operations" :

}

But it returns error yet.