I did two things here.
1 - update to systemu 2.4.0 to avoid warnings from ruby 1.9.3
I was getting...
/Volumes/Code/xxxxx/vendor/ruby/1.9.1/gems/systemu-2.2.0/lib/systemu.rb:29: Use RbConfig instead of obsolete and deprecated Config.
2 - added a Gemfile and .gitignore to make dev/testing easier with Bundler/RVM
updated systemu gem to 2.4.0 to play nice with ruby 1.9.3
thanks so much. 1.5.0 is out.