Merge pull request #29 from mdornseif/master

PEP8 compliance
Fixed demo app to work with both python 2.5 (simplejson) and 2.7
(builtin json).
Update README.markdown

Fixed indentation in appengine_config.py sample
Merge pull request #36 from rjernst/master

Fix for issue #31 (Can't run demo code in python2.7)
Merge pull request #38 from girasquid/patch-1

Update README.markdown
Revert "With AppEngine/python27 I see occasional problems that there is no session initialized. This patch makes the error 1) non-fatal and 2) debugging much easier."

This reverts commit ec71d8b7dd0569ffefbaa066d1fe0a81cf5c0fec.
Merge https://github.com/dound/gae-sessions