Merge pull request #1089 from bf4/add_logger

Add ActiveModelSerializers.logger with default null device

lib/active_model/serializer/railtie.rb

@@ -1,6 +1,12 @@
 require 'rails/railtie'
 module ActiveModel
   class Railtie < Rails::Railtie
+    initializer 'active_model_serializers.logger' do
+      ActiveSupport.on_load(:action_controller) do
+        ActiveModelSerializers.logger = ActionController::Base.logger
+      end
+    end
+
     initializer 'generators' do |app|
       app.load_generators
       require 'generators/serializer/resource_override'