Log Message:
Update ruby-rspec-rails to 3.2.0.

### 3.2.0 / 2015-02-03
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.1.0...v3.2.0)

Enhancements:

* Include generator for `ActionMailer` mailer previews (Takashi Nakagawa, #1185)
* Configure the `ActionMailer` preview path via a Railtie (Aaron Kromer, #1236)
* Show all RSpec generators when running `rails generate` (Eliot Sykes, #1248)
* Support Ruby 2.2 with Rails 3.2 and 4.x (Aaron Kromer, #1264, #1277)
* Improve `instance_double` to support verifying dynamic column methods defined
  by `ActiveRecord` (Jon Rowe, #1238)
* Mirror the use of Ruby 1.9 hash syntax for the `type` tags in the spec
  generators on Rails 4. (Michael Stock, #1292)

Bug Fixes:

* Fix `rspec:feature` generator to use `RSpec` namespace preventing errors when
  monkey-patching is disabled. (Rebecca Skinner, #1231)
* Fix `NoMethodError` caused by calling `RSpec.feature` when Capybara is not
  available or the Capybara version is < 2.4.0. (Aaron Kromer, #1261)
* Fix `ArgumentError` when using an anonymous controller which inherits an
  outer group's anonymous controller. (Yuji Nakayama, #1260)
* Fix "Test is not a class (TypeError)" error when using a custom \ 
`Test` class
  in Rails 4.1 and 4.2. (Aaron Kromer, #1295)