intridea/omniauth-identity — pull request #10 by natebird (2011-12-13 16:22:00+00:00)
Title: Make bcrypt-ruby a runtime dependency so it works out of the box

As noted by Ryan Bates in the RailsCast on OmniAuth Identity it currently requires you to add both omniauth-identity and bcrypt-ruby gems to the gemfile in order to work properly. Changing the bcrypt gem to be a runtime dependency allows it to work out of the box.