Made kaminari work better with polymorphic eager loading in rails 3.

Conflicts:

	lib/kaminari/models/active_record_relation_methods.rb

lib/kaminari/models/active_record_relation_methods.rb

@@ -10,7 +10,7 @@ module Kaminari
 
       def total_count #:nodoc:
         # #count overrides the #select which could include generated columns referenced in #order, so skip #order here, where it's irrelevant to the result anyway
-        c = except(:offset, :limit, :order).count
+        c = except(:offset, :limit, :includes, :order).count
         # .group returns an OrderdHash that responds to #count
         c.respond_to?(:count) ? c.count : c
       end