Collect snapshot

Use "yum version" command to obtain a hash for the current
snapshot of the packages that are currently installed from
the reference updates repository.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Increase data format version

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Release 0.4.1-1

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>