Base ruboto.yml file with comments to explain options
Empty YAML file returns false, so force it to {}
New option for specifying --ruby-version in ruboto gen app
Specify where to set the ruby_version
Copies default ruboto.yml; uses the ruby_version to strip away unneeded stdlib versions
Set the ruby_version in the jruby_adapter task
Merge branch 'master' of https://github.com/ruboto/ruboto