Make it work, add template for inspiration

This pushed fine to my Stackato installation but gave a default message instead of the intended text.  I've fixed that (request routing issue, I think), added a template for inspiration (and to show how darn easy it is), specified a full response to show how it's done (though cribbed from the docs).

If you're not interested in maintaining this long-term I'll be happy to take it over; I'm intending to make a small webapp out of it to put it out of "hello, world" territory.  If you're happy to accept pull requests then that's great as well.  :)