opscode/chef — pull request #189 by iafonov (2011-11-23 11:41:00+00:00)
Title: Fixed rollback action for deploy provider

Fixes both [CHEF-1816](http://tickets.opscode.com/browse/CHEF-1816) and [CHEF-2723](http://tickets.opscode.com/browse/CHEF-2723). Cucumber feature was added to test rollback for revision based deploy provider. Refactored rollback action to be more transparent and straightforward for a next developer who will want to do something with deploy provider.