[TASK] Raise version to 1.0.0-dev (stable)

Change-Id: Id18fc7d8a5c46355b5452eb68f87e6db1d288fe0
Reviewed-on: http://review.typo3.org/32078
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>