Don't lose source location of the pagination method

lib/kaminari/models/active_record_model_extension.rb

@@ -9,7 +9,7 @@ module Kaminari
 
       # Fetch the values at the specified page number
       #   Model.page(5)
-      eval <<-RUBY
+      eval <<-RUBY, nil, __FILE__, __LINE__ + 1
         def self.#{Kaminari.config.page_method_name}(num = nil)
           limit(default_per_page).offset(default_per_page * ((num = num.to_i - 1) < 0 ? 0 : num)).extending do
             include Kaminari::ActiveRecordRelationMethods