Add missing action to root_path in readme
Add missing action to root_path in readme

On ruby-1.9.2-p136 I got the following error when using `root :to => "home"`:

    actionpack-3.0.5/lib/action_dispatch/routing/mapper.rb:171:in `default_controller_and_action': missing :action (ArgumentError)

Specifying the action solves the problem.

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sterzz/devise,cefigueiredo/devise,yizjiang/devise