[RELEASE] Release of TYPO3 6.1.12

Change-Id: If1ce879e763b18ef0124317ff63b3afbeb2073a8
Reviewed-on: http://review.typo3.org/33465
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>