install_package "jruby-1.6.4" "http://jruby.org.s3.amazonaws.com/downloads/1.6.4/jruby-bin-1.6.4.tar.gz" jruby
install_package "rubygems-1.6.2" "http://production.cf.rubygems.org/rubygems/rubygems-1.6.2.tgz" ruby