require rails >= 3.2

* remove ancient confusing comment in SerializerGenerator

lib/active_model_serializers.rb

@@ -11,8 +11,6 @@ if defined?(Rails)
   module ActiveModel
     class Railtie < Rails::Railtie
       generators do |app|
-        app ||= Rails.application # Rails 3.0.x does not yield `app`
-
         Rails::Generators.configure!(app.config.generators)
         Rails::Generators.hidden_namespaces.uniq!
         require_relative "generators/resource_override"

lib/generators/serializer/serializer_generator.rb

@@ -25,9 +25,6 @@ module Rails
       def parent_class_name
         if options[:parent]
           options[:parent]
-        # Only works on 3.2
-        # elsif (n = Rails::Generators.namespace) && n.const_defined?(:ApplicationSerializer)
-        #   "ApplicationSerializer"
         elsif defined?(::ApplicationSerializer)
           "ApplicationSerializer"
         else