Added bounding boxes for PDFs, fixed math stuff in section 2

I still can't build with PDFs that have no bounding box.  Something in
the \includegraphics you are using (not in the MiKTeX 2.9 distro) lets
Berkeley-based builds work.  Magic.  I like EPS.
No-op
Merge branch 'master' of https://github.com/slbird/pacora-isca-2013