[RELEASE] Release of TYPO3 4.7.9

Change-Id: I8b8d427eccd91acc5b357efa75925530a2a3462e
Reviewed-on: https://review.typo3.org/18745
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team
[TASK] Set TYPO3 version to 4.7.10-dev

Change-Id: Idf034660e824089eb9767bd39113ef4028d8248a
Reviewed-on: https://review.typo3.org/18746
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team