(CFACT-160) Add cfacter wrapper method

Used by the Native Facter (cfacter) project to run acceptance tests.
Merge pull request #540 from MikaelSmith/bug/master/CFACT-160-add-cfacter-wrapper

(CFACT-160) Add cfacter wrapper method
(QENG-437) beaker: EOL 1.8 ruby

- remove code chunks built for ruby 1.8
- update rspec + minitest, remove test/unit
- update spec tests to meet current rspec standard, here's a good
  reference
  http://teaisaweso.me/blog/2013/05/27/rspecs-new-message-expectation-syntax/