Classify causes plural model names to be incorrectly renamed

Some model names will be renamed incorrectly e.g. 'business'. It should
be the responsibility of the user to make sure they use a name that
directly corresponds to the model name. The only filtering performed
should be camelize.

lib/cancan/controller_resource.rb

@@ -145,7 +145,7 @@ module CanCan
     def resource_class
       case @options[:class]
       when false  then name.to_sym
-      when nil    then (@name || namespaced_name).to_s.classify.constantize
+      when nil    then (@name || namespaced_name).to_s.camelize.constantize
       when String then @options[:class].constantize
       else @options[:class]
       end