import spotify.spec from https://github.com/marguerite/opensuse-spotify-installer
fix whitespace issues
improve descriptions
change URL to point to the downloads page
update package version to 0.8.8
update spotify.spec to 0.8.8 and make many improvements

- moved to /opt
- rename to spotify-client for consistency with original Debian package
- use provided register.sh and unregister.sh
- remove need to conflict with libopenssl0_9_8
- fix automatically generated dependencies
- fix XDG categories
- move dedicated library directory to /opt/spotify/spotify-client/lib
- remove spotify-linux-512x512.png since redistribution probably
  violates Spotify copyright
- fix SPOTIFY_CLEAN_CACHE test
- fix passing of multiple arguments to spotify binary
require libpng12-0
add a comment about Fedora/Mandriva
force cleaning of cache
tweak spotify license
recommend libmp3lame0 in spotify.spec
update installer to build 0.8.8 via new spec file
add spotify-installer.spec
we don't need to require brp-check-suse, although it is handy
rename spotify.spec to spotify-client.spec to match package name