[RELEASE] Release of TYPO3 4.5.27

Change-Id: I340309f0355c3b2a1d976ea4cdcd067ac66e226a
Reviewed-on: https://review.typo3.org/21026
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team
[TASK] Set TYPO3 version to 4.5.28-dev

Change-Id: I2ad5f71706e9caeaa0e1b2c32b95d075334b24ef
Reviewed-on: https://review.typo3.org/21027
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team