The library path is specified as /lib/ at line 64 of ComicBook.js.
However, if you have a compiled-only project (i.e. only the contents of /comicbook/ are on your served path), the pixtastic files are located in /comicbook/js/.
You can override this when you're creating a comicbook view var book = new ComicBook(), but it makes sense that the built-version should have the correct path.