Add "change" as KeyboardEvent

[rentalhost]

Like:

    createEvent: function(type, options) {
        if (/^mouse(over|out|down|up|move)|(dbl)?click$/.test(type)) {
            return this.mouseEvent(type, options);
        } else if (/^key(up|down|press)|change$/.test(type)) {
            return this.keyboardEvent(type, options);
        }
    },

It'll support: object.simulate("change").