[TASK] Update TYPO3 copyright in all branches

The copyright notice (e.g. shown in the footer
of Backend Login) should be updated to 2015.

Resolves: #64597
Releases: master, 6.2, 4.5
Change-Id: I84bfe7eb53acb8896c45fc0788f53da4edadbdf8
Reviewed-on: http://review.typo3.org/36363


Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Reviewed-by: Frederic Gaus <gaus@flagbit.de>
Tested-by: Frederic Gaus <gaus@flagbit.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>