Recode the MySQL, Postgresql and ShelveSessionStore stores.
(Version 0.1.0 only supports DirectorySessionStore at the moment.)

ShelveSessionStore has no file locking, so is unsafe for multi-process
deployment (SCGI, CGI, FastCGI).

Generate documentation
pdoc --html   --all-submodules --html-dir docpdoc session3
pycco --generate_index --paths --directory pyccodocs  ./**/*.py

pycco --generate_index --paths -s  --directory pyccdocs  ./**/**/*.py ./session3/*.py
rst2html5.py --footnote-references=superscript --smart-quotes=yes -g -d -t  README.rst > README.html


Correct Manifest.in, README.md (and its links). Add server for testing.
Update Makefile with changes (e.g. for creating documentation).
