Support RSpec 2 and RSpec 3 define matcher messages
Support RSpec 2 and RSpec 3 define matcher messages

  - Use Ruby's Object#defined? to figure out which RSpec define matcher
    failure message methods are in scope
    - RSpec 2 uses failure_message_for_should and
      failure_message_for_should_not
    - RSpec 3 uses failure_message and failure_message_when_negated

stitchfix/resqutils