- Apparmor profile (usr.lib.colord): Add capability dac_override
(boo#948892).

- Add gpg signature

- Update to version 1.2.12:
+ New Features: Add a new private library libospark for future
use.
+ Bugfixes:
- Allow creating devices with the same device ID from different
users.
- Check for, and prefer, libsystemd over libsystemd-login.
- ColorHug:
. Add ch_device_queue_read_firmware().
. When converting HEX to BIN pad out the entire size.
- Replace pkgconfig(libsystemd-login) for pkgconfig(libsystemd)
following upstreams new preferance. Also pass
--enable-systemd-login to configure to ensure we build this
support.