[4 Jan 09]

* Upgrade for Rails 2.2

  API CHANGES:
  
  * Use attribute_original instead of original_attribute

[13 May 08]

* Do not freeze attributes any more.

[2 Feb 08]

* Make #reload take an options argument.

[14 Sep 07]

* Update for edge rails (> r7315).

  API CHANGES:
  
  * #modified? no longer accepts the :reload argument
  * #clear_original_attributes and #restore_attributes no longer taks :only or :except arguments

[26 July 07]

* Added :only option to specify the attributes that should be monitored.

* Allow :changed to be passed to modified_attributes to return the current values.

[28 Jun 07]

* Add excluded_attribute? method and fix compatibility with CGI::Session::ActiveRecordStore::Session

[17 Jun 07]

* Fix compatibility with Ruby < 1.8.6

[11 Jun 07]

* Reimplement using instance variables rather than a hash. API unchanged.

[7 Jun 07]

* Make modified? return true for new records

* Pass :except to name attributes whose modification should not cause modified to be true

* Allow acts_as_modified to be redeclared on subclasses

[29 Mar 07]

* Fix compatibility with Ruby 1.8.6

[13 Dec 06]

* Make plugin compatible with models that define a primary key attribute other than id.