[RELEASE] Release of TYPO3 6.2.8

Change-Id: I6854ba7093276dee590132c85013b18cf25ad5a9
Reviewed-on: http://review.typo3.org/35160
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>