[TASK] Set TYPO3 version to 7.0.1-dev

Change-Id: I36cd3dcbf167dd3565c8be18417305ba4cd8d97a
Reviewed-on: http://review.typo3.org/34956
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>