ANN: updates to Python-by-example

[Rainy]

Python-by-example <a href="http://pbe.lightbird.net/index.html">http://
pbe.lightbird.net</a> has some new modules added: pickle, shelve,
sqlite3, gzip, csv, configparser, optparse, logging. I also changed
over to using excellent sphinx package to generate documentation, this
will allow me to add pdf and windows help formats soon (I ran into
some issues with that, actually). More modules coming soon, too! -AK