Clarify license terms for Romain Guy's artwork.

As discussed with Romain Guy in the email thread, the Apache 2.0
license applies to the affected .jpg files now and retroactively from
the time of import.

The images were altered using the exiftool:

exiftool -WebStatement=http://www.apache.org/licenses/LICENSE-2.0

Change-Id: Ie5b968b213a0f22416d8f46172a59eabb4ae3923
2 files changed