fixed to handle incorrect json returned by server - invalid format for timestamps:
Server response:
{
  "servers": [
    {
      "created_at": timestamp(1380311621.0),
      "updated_at": null,
      "name": "ns1.xxxx.xxxx.com.",
      "id": "2d13962f-d99c-4249-8d75-6160e5233e7f"
    }
  ]
}
Converted to:
{
  "servers": [
    {
      "created_at": "1380311621.0",
      "updated_at": null,
      "name": "ns1.xxxx.xxxx.com.",
      "id": "2d13962f-d99c-4249-8d75-6160e5233e7f"
    }
  ]
}

Probably should better to be fixed on the server