Log Message:
Update ruby-rspec-rails to 3.2.3.

### 3.2.3 / 2015-06-06
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.2.2...v3.2.3)

Bug Fixes:

* Fix regression with the railtie resulting in undefined method `preview_path=`
  on Rails 3.x and 4.0 (Aaron Kromer, #1388)

### 3.2.2 / 2015-06-03
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.2.1...v3.2.2)

Bug Fixes:

* Fix auto-including of generic `Helper` object for view specs sitting in the
  `app/views` root (David Daniell, #1289)
* Remove pre-loading of ActionMailer in the Railtie (Aaron Kromer, #1327)
* Fix undefined method `need_auto_run=` error when using Ruby 2.1 and Rails 3.2
  without the test-unit gem (Orien Madgwick, #1350)
* Fix load order issued which causes an undefined method `fixture_path` error
  when loading rspec-rails after a spec has been created. (Aaron Kromer, #1372)