Update ruby-rspec-rails to 2.12.0.

### 2.12.0 / 2012-11-12
[full changelog](http://github.com/rspec/rspec-rails/compare/v2.11.4...2.12.0)

Enhancements

* Support validation contexts when using `#errors_on` (Woody Peterson)
* Include RequestExampleGroup in groups in spec/api

Bug fixes

* Add `should` and `should_not` to `CollectionProxy` (Rails 3.1+) and
  `AssociationProxy` (Rails 3.0).  (Myron Marston)
* `controller.controller_path` is set correctly for view specs in Rails 3.1+.
  (Andy Lindeman)
* Generated specs support module namespacing (e.g., in a Rails engine).
  (Andy Lindeman)
* `render` properly infers the view to be rendered in Rails 3.0 and 3.1
  (John Firebaugh)
* AutoTest mappings involving config/ work correctly (Brent J. Nordquist)
* Failures message for `be_new_record` are more useful (Andy Lindeman)

### 2.11.4 / 2012-10-14
[full changelog](http://github.com/rspec/rspec-rails/compare/v2.11.0...v2.11.4)

Capybara-2.0 integration support:

* include RailsExampleGroup in spec/features (necessary when there is no AR)
* include Capybara::DSL and Capybara::RSpecMatchers in spec/features

See [https://github.com/jnicklas/capybara/pull/809](https://github.com/jnicklas/capybara/pull/809)
and [http://rubydoc.info/gems/rspec-rails/file/Capybara.md](http://rubydoc.info/gems/rspec-rails/file/Capybara.md)
for background.

2.11.1, .2, .3 were yanked due to errant documentation.

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