added yast RPM macros (/etc/rpm/macros.yast)

- use *.spec directly instead of expanding *.spec.in
- make *.spec.in files optional (do not fail if missing)
- 3.0.6
explained where the spec.in changes apply
VERSION: 3.1.0 for openSUSE-13.2
Merge pull request #28 from yast/remove_spec_in

Remove spec in