Update Gemfile dependencies.
Add unit tests to Rakefile.
Add Guardfile.
Add spec coverage for rbenv_ruby resource.
Add spec coverage for rbenv_global resource.
Refactor spec description in ruby_spec.
Add spec coverage for rbenv_gem resource.
Add spec coverage for rbenv_rehash resource.
Add spec coverage for rbenv_script resource.
Update .kitchen.yml format.
Update to Berkshelf 3.0 syntax in Berksfile.
Merge pull request #75 from fnichol/testify

Update testing support and add unit tests for existing resources