README.md - install bundler from distribution RPMs
Alternatively install yast2-core from YaST:Head:ruby
Merge pull request #20 from lslezak/bunder_rpm

README.md - install bundler from distribution RPMs
added tune.patch for compiling yast2-tune
Merge pull request #22 from lslezak/compile_tune_module

Added tune.patch for compiling yast2-tune
Merge pull request #21 from lslezak/yast_core_rpm

README.md - Alternatively install yast2-core from YaST:Head:ruby
removed obsoleted (dropped) modules
removed modules which do not contain any *.ycp files
Merge pull request #24 from lslezak/master

Removed YAML files for dropped modules
Merge pull request #19 from mvidner/master

Document the tree restructuring
doc: tree: +servers_non_y2