Use six to be Python 3 compatible
Require six when installed
Removed six dependency in favor of a compatibility module.
Merge branch 'python3'

Conflicts:
	flask_peewee/rest.py
Fix test that had hardcoded ordering of url params
Py3k import fix.
Fix serializer list behavior, fixes #146
Revert "Fix serializer list behavior, fixes #146"

This reverts commit 1957706726efd16802fd41212bc6ba4c0ef64059.
Version
maintenance mode
Merge remote-tracking branch 'remotes/coleifer/master'