Fixed a 'stack level too deep' bug in mongoid

Fixes #642

lib/kaminari/models/mongoid_extension.rb

@@ -20,7 +20,7 @@ module Kaminari
             kls.send(:include, Kaminari::MongoidExtension::Document.dup)
           end
           alias_method_chain :inherited, :kaminari
-        end
+        end unless respond_to?(:inherited_with_kaminari)
       end
     end
   end

spec/fake_app/mongoid/models.rb

@@ -20,6 +20,10 @@ class Device < Product
   paginates_per 100
 end
 
+class Android < Device
+  paginates_per 200
+end
+
 class MongoMongoidExtensionDeveloper
   include ::Mongoid::Document
   field :salary, :type => Integer

spec/models/mongoid/mongoid_spec.rb

@@ -218,6 +218,11 @@ if defined? Mongoid
         subject { Device.all.page 1 }
         its(:limit_value) { should == 100 }
       end
+
+      context 'when paginates_per is defined in subclass of subclass' do
+        subject { Android.all.page 1 }
+        its(:limit_value) { should == 200 }
+      end
     end
   end
 end