- Initial Leap 16.0 version
* Distribution agnostict wallpaper for all of our distributions
gh#openSUSE/branding#156
* A Bluetail Day Gecko, endemic to the small island of Mauritius.
Photo competition gh#openSUSE/wallpapers#18
* Add Buildrequires for rsvg-convert and optipng to support
svg -> png generation on build time
* Use github branch .zip export to be consistent with rest of
branding-* packages. Was tar.xz with tar -C wallpapers -cvf ...

- Add wallpapers-openSUSE-extra-leap15 subpackage with wallpapers
from Leap 15
* This approach eventually obsoletes gos-wallpapers and simplify
wallpaper situation in openSUSE
* Apply suggestsions from spec-cleaner