Log Message:
Update ruby-rspec-rails to 3.2.1.

### 3.2.1 / 2015-02-23
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.2.0...v3.2.1)

Bug Fixes:

* Add missing `require` to RSpec generator root fixing an issue where Rail's
  autoload does not find it in some environments. (Aaron Kromer, #1305)
* `be_routable` matcher now has the correct description. (Tony Ta, #1310)
* Fix dependency to allow Rails 4.2.x patches / pre-releases (Lucas Mazza, #1318)
* Disable the `test-unit` gem's autorunner on projects running Rails < 4.1 and
  Ruby < 2.2 (Aaron Kromer, #1320)