Fixed gem versions and add testing via Rakefile
Partially revert "Fixed gem versions and add testing via Rakefile" to remove changes committed by mistake

This reverts commit 430d4f37848f33600994eb377fd3cd026d55e5c9.
Fixes for Rubocop issues. Some cops left excluded to allow for knife-cookbook-doc
Merge pull request #13 from bendodd/testing

Added testing via Rake, Rubocop baseline and fixed gem versions