add sphinx project and switching hub chapter

This document is written in Japanese, so a Japanese version
of Sphinx and Latex is necessary to build PDF.
I use the following packages:

ftp://ftp.kddilabs.jp/CTAN/systems/texlive/Images/texlive2013-20130530.iso
https://bitbucket.org/sphinxjp/website/downloads/Sphinx-1.1.3sphinxjp-latex.tar.gz

The instructions for build environment is here:

http://sphinx-users.jp/cookbook/pdf/latex.html

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>