Merge from vendor branch TNF:

Merge from vendor branch TNF:
Importing rspec-rails version 2.6.1, it is for Ruby on Rails 3.

# rspec-rails-2

rspec-2 for rails-3 with lightweight extensions to each

NOTE: rspec-2 does _not_ support rails-2. Use rspec-rails-1.3.x for rails-2.

## Documentation

* [Cucumber features](http://relishapp.com/rspec/rspec-rails/v/2-0)
* [RDoc](http://rubydoc.info/gems/rspec-rails/2.0.1/frames)