TODO:
    - Handle immutable classes
    - Handle many-to-many
    - Make sure with $artist->cds( ... )->slice( 0 )->artist that $artist and ->artist are the same
    - Make save alias for update_or_create
    - Better ->_model__ accessor (so ugly)

0.004 Friday June 12 09:09:24 PDT 2009:
    - Integrated after, before, around method modification
    - Added update_or_create

0.003 Friday April 24 09:21:37 PDT 2009:
    - _model__ renaming and additional accessors

0.002 Thursday April 23 17:21:43 PDT 2009:
    - Fixed some documentation

0.001 Thursday April 23 16:56:48 PDT 2009:
    - Initial release (wonder what this button does...)