Fix ISO8601_REGEX import (import it from iso8601)
Update CHANGES.txt
Merge branch 'master' of https://github.com/cedricmessiant/deform into cedricmessiant-master

Conflicts:
	CHANGES.txt
Build 'docs' as one of the default environments under tox.
Merge branch 'cedricmessiant-master'
Make setup less noisy.