thoughtbot/clearance — pull request #441 by geoffharcourt (2014-07-08 18:13:03+00:00)
Title: Fix deprecated matcher method on DenyAccessMatcher

`DenyAccessMatcher` uses `#negative_failure_message`, which has been deprecated
in favor of the newer RSpec matcher method `#failure_message_when_negated`.
Renamed this instance variable and the `attr_reader` to remove RSpec 3.0
deprecation warnings when using `DenyAccessMatcher` in specs.