function KeyValuePair(properties) {
        if (properties)
            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                if (properties[keys[i]] != null)
                    this[keys[i]] = properties[keys[i]];
    }
Constructs a new KeyValuePair.
@exports KeyValuePair
@classdesc Represents a KeyValuePair.
@implements IKeyValuePair
@constructor
@param {IKeyValuePair=} [properties] Properties to set