[Review] Request from 'tgoettlicher' @ 'SUSE/machinery/review_140731_show_installation_instructions_for_glance_client_on_sle12_if_not_installed'

Please review the following changes:
  * f53f8b2 Show installation instructions for glance client on SLE12 if not installed
  * 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