Remove site key property from reference representation

[jimmyca15]

The reference representation of an object is the abbreviated version that appears when the resource is embedded into another resource. Only select fields are displayed to make the resource human recognizable. The site key was added to the website reference representation and it should be removed to prevent bloating of this abbreviated view.

in 2.0.0 the website reference representation appears as thus

"website": {
    "name": "Default Web Site",
    "id": "o06wRhVwLlRQKMtJ876dLQ",
    "key": "1",
    "status": "started",
    "_links": {
        "self": {
            "href": "/api/webserver/websites/o06wRhVwLlRQKMtJ876dLQ"
        }
    }
}

it should be

"website": {
    "name": "Default Web Site",
    "id": "o06wRhVwLlRQKMtJ876dLQ",
    "status": "started",
    "_links": {
        "self": {
            "href": "/api/webserver/websites/o06wRhVwLlRQKMtJ876dLQ"
        }
    }
}

[jimmyca15]

The site key can still be retrieved when using the web sites API through the use of the fields query string parameter

ex: GET /api/webserver/websites?fields=name,status,key

[jimmyca15]

Fixed in #121