Explicitly selecting 'base' and 'minimal' patterns for installation

- bnc#875350
- selection can be removed manually by user if needed
Changes and version
Merge pull request #32 from kobliha/software-default_patterns

Patterns 'base" and 'minimal' should be pre-selected by default
fix case of pattern
release
Merge pull request #33 from yast/fix_typo

Fix typo
download release notes for add-ons (bnc#876700)
Merge pull request #34 from jsrain/master

download release notes for add-ons (bnc#876700)
add bootloader update proposal for s390(bnc#877324)
release
improve changelog message (thanks to mvidner)
Merge pull request #35 from yast/fix_s390_boot_upgrade

Fix s390 boot upgrade