[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.