[TASK] Bump the version number to 0.7.78.

Change-Id: Id9689b5271a31d43fa4c6568a749e2329d22aa2d
Reviewed-on: http://review.typo3.org/32489
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>