Revert "[RELEASE] Release of TYPO3 7.0.0"

This reverts commit 4d2c54754eba12688c1ececa2b3dae51b313ad76.

Change-Id: I1375a77d97001a3dab3ef9efc6cec971efedad9f
Reviewed-on: http://review.typo3.org/34952
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>