Please include chapter.recipe numbers in book headings

Hi-
 I'm following the book and the source code, git clone'd to disk. Like it a lot, but it's hard to navigate because there are no common keys. "Responding to Click Events using Controllers" corresponds to chapter1 / recipe3.

It'd be nice if the Header were instead "1.3 Responding to Click Events using Controllers"

I could massage the text and do a PR if you agree.
