Gemfile, Guardfile and .envrc added, towards a better tooling to enable clean and testable cookbooks.
Added foodcritic and rubocop.
Applied rubocop and foodcritic recommendations (except for FC001).
Added chefspecs, serverspecs and a Rakefile wrapper to run tools.
Everythiing is working ok on a chefdk 2.0 installation (plus a bundle install), although I needed to use 'bundle exec' for the additional tools, guard, etc...
Need to try it on a pre MacOS 10.7 environment, to see if a gem installation provides a sane environment.