patch builder

@anutron pointed yesterday that `Request.JSON` is not being packaged in one single file with Core + More, but is there when just Core is downloaded separately.

I have to learn this problem and make specs for it. In the meantime, since its kind of urgent matter we could patch builder page/jade so Core is not included by default (until we debug why Request.JSON is not being included).

If you agree to this I propose the website is updated asap.