[TASK] Set TYPO3 version to 7.0.2-dev

Change-Id: I3177eaa28d95407f69a82da2ba74d47cb69c6379
Reviewed-on: http://review.typo3.org/35226
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>