Keeping a page away from Google

I like to put up a page I'm working on with a client so they can see the progress and we can have something to talk about.  I usually build the site initially in some obscure subfolder that no one is likely to stumble onto it by chance by entering www.mysite/theobscuresitefoldername and see it. But I know search engines crawl over everything on the web so it's possible, it seems, that the site in progress could still be found by Google and get indexed.  Is there something I can put on the site that Google, and othe rsearch engines will respect, and leave the site alone?  I know about nofollow but I t hink that's just something you can put on a link to keep Google from following it.  I need something that keeps Google out of the whole page.

Thanks.