[RELEASE] Release of TYPO3 6.0.5rc1

Change-Id: I952f506736290dc6e82171f212e877b1450b232e
Reviewed-on: https://review.typo3.org/20091
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team
[TASK] Set TYPO3 version to 6.0-dev

Change-Id: I4394a4e5c01e00c89d25d0ddbabc1f677856fe73
Reviewed-on: https://review.typo3.org/20092
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team