[TASK] Set TYPO3 version to 7.0.1-dev

Change-Id: I7aa85af5ab56c91e9d313732e093b6f0b92eb78e
Reviewed-on: http://review.typo3.org/34950
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>