[RELEASE] Release of TYPO3 6.0.5

Change-Id: Icacd0c2f2d264b1e0c9b18c9ef18847ccf41e8fb
Reviewed-on: https://review.typo3.org/20446
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team
[TASK] Set TYPO3 version to 6.0.6-dev

Change-Id: Ibea4def67384953b32d81b36b4c57ce750e85ae2
Reviewed-on: https://review.typo3.org/20447
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team