[Review] Request from 'aduffeck' @ 'SUSE/machinery/review_140917_remove_global_puts_stub'

Please review the following changes:
  * ebfa1de Encapsulate all machinery output into Machinery::Ui methods
Hm, yes. I originally thought it was only about fixing Pry and debug statements, but I get your point. I'll add another commit to the pull request which changes that.