No longer detects which fields to clean by default

[ricktessner]

The following code will do no cleansing of any text or string fields. It looks like the column type collection code was removed in the upgrade to work with rails 2.2 aka commit de6b8e7

class Comment < ActiveRecord::Base
    acts_as_sanitized
end

In order for it to work, I'd have to pass in :clean_fields => [...]. And ditto for the :strip_fields option.