LFS-BOOK PDF generation

[Gerard Beekmans]

> Looking at the dingbats, http://en.wikipedia.org/wiki/Dingbat, I don't see where 
> italic or bold dingbats make sense.  We can just ignore these warnings.
>
>   

Alright. I've enabled the PDF section in the nightly LFS render script. 
I'm running it through cron ahead of schedule in a few minutes to make 
sure it's able to find all the JDK, FOP and FAI stuff.

G