Merge pull request #18 from jsuchome/master

- use OSRelease instead of obsolete SuSERelease (bnc#833955)
Merge pull request #19 from jsuchome/master

fixed tests: no more reading target.string in constructor
sw_single - disable "ignore recommended packages for already installed packages"

at the first run (then use the stored setting) (bnc#835968)

- 3.0.3
Merge pull request #20 from yast/ignore_recommended

sw_single - disable "ignore recommended packages for already installed packages"
- do not install xorg-x11 package (bnc#837450)
- 3.0.4