[Review] Request from 'aduffeck' @ 'SUSE/machinery/review_140731_fix_rspec_deprecation_warnings'

Please review the following changes:
  * 59b90e2 Fix RSpec deprecation warnings about old "stub" syntax
  * 78e5c53 Get rid of global RemoteSystem#connect stub
  * a78bea2 Fix "analyze -o config-file-diffs" on SLES12 systems
  * 4b936e5 Merge pull request #8 from SUSE/review_140731_improve_error_handling
  * f7053ee Merge pull request #10 from SUSE/improve-man-page-3
  * 6297fbc Improve build matrix intro paragraph in machinery man page
  * b358f33 Remove germanism from machinery man page
  * 96f6b53 Do not continue inspecting the system in case of unexpected errors
  * 136aa85 Handle unexpected errors appropriately
  * 9930c76 Handle "MachineryError"s appropriately
  * af42212 Streamline exception classes and names
  * 6485c64 Remove obsolete exception class