4.1.0

Enhancements

• Adds activeresource.rb so require: 'active_resource' is no longer needed
  in Gemfile. (#95, Pedro Nascimento)
• ActiveResource::Collection delegates all instance methods for Array.
  (#101, printercu)
• Railtie enables configuration and dev reloading of observers just like
  ActiveRecord when using Active Resource with Rails. Active Resource also now runs Active Support
  load hooks for :active_resource. (#109, Ches Martin)

Fixes

• Improvement to thread safety of headers. (#61, niedfelj)
• A belongs_to child with a missing parent ID returns nil for the
  association instead of making a bogus remote call. (#68, Javier Saldana)
• A has_many association does not trigger a remote call if parent is a new
  record. (#97, Sasha Shamne)