Fill in parameters to help construct a request message.
This function doesn't fill in every parameter.
The accessor object should be like:
{consumerKey:'foo', consumerSecret:'bar', accessorSecret:'nurn', token:'krelm', tokenSecret:'blah'}
The accessorSecret property is optional.
function completeRequest(message, accessor) {
        if (message.method == null) {
            message.method = "GET";
        }
        var map = OAuth.getParameterMap(message.parameters);
        if (map.oauth_consumer_key == null) {
            OAuth.setParameter(message, "oauth_consumer_key", accessor.consumerKey || "");
        }
        if (map.oauth_token == null && accessor.token != null) {
            OAuth.setParameter(message, "oauth_token", accessor.token);
        }
        if (map.oauth_version == null) {
            OAuth.setParameter(message, "oauth_version", "1.0");
        }
        if (map.oauth_timestamp == null) {
            OAuth.setParameter(message, "oauth_timestamp", OAuth.timestamp());
        }
        if (map.oauth_nonce == null) {
            OAuth.setParameter(message, "oauth_nonce", OAuth.nonce(6));
        }
        OAuth.SignatureMethod.sign(message, accessor);
    }