preference_fu 0.0.3

This plugin, greatly inspired by Jim Morris' blog post (http://blog.wolfman.com/articles/2007/08/07/bit-vector-preferences), aims to make it easy and flexible to store boolean preferences for an ActiveRecord model.This can be also used as a very quick way to setup an ACL. Because the values are stored within a bit vector, a virtually unlimited number of preferences can be created without additional migrations.