Update setup.py
2.6 compability
Revert "Update setup.py"

This reverts commit 86345fcabda6f9a1bf0aafa9c9d8c90d127ad085.
Add support for a prefix in JsonFormatter
Merge https://github.com/madzak/python-json-logger

Conflicts:
	src/jsonlogger.py
Add support for datetimes < 1900
Merge pull request #11 from novapost/master

Some contributions