(#22857) officially support ruby 2.0

To corespond with puppet >= 3.2 Ruby 2.0 support:
    http://docs.puppetlabs.com/puppet/3/reference/release_notes.html#ruby-20-support
Merge branch 'ruby-2_0-support' of https://github.com/jhoblitt/facter into jhoblitt-ruby-2_0
(#22857) Note that ruby 2.0.0 should be at least p195.