Fix AS::Duration#duplicable? on 1.8

Documentation Error Fixed for ticket #839

Make Rake::DSL methods available within Railtie rake_tasks block (so we're compatible with Rake 0.9.0).

Handle polymorphic_type NOT NULL columns

Enhanced test for duplicable in  active_support/core_ext/object/duplicable.rb

Not updating rubyforge for new versions. 

Check for Module.new.dup as well in https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/object/duplicable.rb

Singularize individual table name

fixed failing tests of ActiveSupport for deprecation test

Corrected a minor ruby19 variable name reuse warning

Fixed some ruby 19 warnings

attr_accessor_with_default removed from ActiveResource

Fixes incompatibility introduced by Rake 0.9.0

Specify the name to be used for ActiveModel::Name fixes #1168

This patch allows to specify the name of your models independent of the class name.

Remove extra white spaces.

Syntax cleanup:  for in => each on ActiveRecord