MCO-457 Remove the json gem from the repository
MCO-457 Remove vendoring artifacts

Here we remove lib/mcollective/vendor/load_json.rb and move the
require of json up from lib/mcollective/vendor/require_vendored and
into lib/mcollective.rb
MCO-457 update packaging metadata to use local json

State the requirement for some kind of ruby in the packaging metadata, and stop
excluding/expecting the vendored json distribution.
Merge pull request #238 from richardc/MCO-457_devendor_json

MCO-457 devendor json