[RELEASE] Release of TYPO3 4.7.11

Change-Id: Ib40af24098f5aa584ddf00e24b3203083b9e8a46
Reviewed-on: https://review.typo3.org/20448
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team
[TASK] Set TYPO3 version to 4.7.12-dev

Change-Id: Ie2df5d2d6746050ceb2d31ee499ea0be142fb22c
Reviewed-on: https://review.typo3.org/20449
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team