Gemfile, Rakefile: update rubocop & chefspec
test: replace deprecated should syntax with expect
Merge pull request #306 from josephholsten/fix-tests

Fix tests
defn: s/provider/provides/ to play nice as a resource
defn: comment sections to describe r/p refactor
defn: refactor helpers to consistent style
defn: make node attribute updates explicit
defn: rm mongodb_type
defn: promote helper vars to full methods