Fix WrongScopeError being thrown on Rails master:

- ### Problem

  Rails made a change in rails/rails@d4367eb
  and TestFixtures don't make use of `method_name` anymore, but simply
  `name`.

  `name` on RSpec raises a `WrongScopeError` when called within an
  example.

  This patch overrides `name` to return the example name instead.

lib/rspec/rails/fixture_support.rb

@@ -50,6 +50,10 @@ def self.proxy_method_warning_if_called_in_before_context_scope(method_name)
             end
           end
 
+          def name
+            @example
+          end
+
           fixtures RSpec.configuration.global_fixtures if RSpec.configuration.global_fixtures
         end
       end