[TASK] Raise version to 2.0.1-dev

Change-Id: Ie4c0459014621f0f848cfb2f4036602e8be6cd79
Reviewed-on: http://review.typo3.org/35340
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>