Bump up RSpec version.  Fix typo in spec.  Switch to pry-byebug for MRI 2.1, so bundle works
Update Rubocop to RuboCop
Merge pull request #745 from petergoldstein/feature/rspec_3_0

RSpec 3.x
relax the hashie constraint < 3.1
Merge pull request #748 from matthewrudy/hashie-3.0

Hashie 3.0.0
Update RuboCop to >=0.23
Merge pull request #750 from intridea/rubocop

Update RuboCop to >=0.23