rack/rack — pull request #455 by BrandonMathis (2012-11-13 21:43:12+00:00)
Title: Add puma as a potential default alongside thin

Thin is great but it is not a preferred alternative to webrick if you are using jruby. This change will allow you to use puma by default just by having `gem 'puma'` in the Gemfile of any rack application.