[TASK] Update jQuery to 1.8.0 (final)

TYPO3 shipped with 1.8b1 already.
Final is out meanwhile.

Change-Id: Ia418fb63d22f518a9224ad1cc4c183817acdd12a
Resolves: #39705
Releases: 6.0
Reviewed-on: http://review.typo3.org/13591
Reviewed-by: Daniel Sattler
Tested-by: Daniel Sattler
Reviewed-by: Philipp Gampe
Reviewed-by: Helmut Hummel
Reviewed-by: Felix Kopp
Tested-by: Felix Kopp
Reviewed-by: Marcus Schwemer
Tested-by: Marcus Schwemer
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer