Doh! APpending -u flag instead of iincluding in default

lib/guard/rails/runner.rb

@@ -33,11 +33,11 @@ module Guard
       rails_options = [
         '-e', options[:environment],
         '-p', options[:port],
-        '-u', options[:debugger],
         '--pid', pid_file
       ]
 
       rails_options << '-d' if options[:daemon]
+      rails_options << '-u' if options[:debugger]
       rails_options << options[:server] if options[:server]
 
       %{sh -c 'cd #{Dir.pwd} && rails s #{rails_options.join(' ')} &'}