Adding support for decorators

[ghost]

I wanted to override the way that the dates get displayed on the proposal scheduling dropdown, and used a decorator to accomplish this. I now have a file at app/decorators/models/open_conference_ware/event_decorator.rb that looks like this:

OpenConferenceWare::Event.class_eval do
  def dates_for_select
    return [['','']] + self.dates.map{|date| [date.strftime("%b %d (%a)"), date.strftime("%Y-%m-%d")]}
  end
end

This required pulling in the decorators gem, and adding some initialization code for it.

[reidab]

I'm not opposed to this, but I wonder if it makes sense to include this in the OpenConferenceWare engine. I'd think that the decorators gem could be added as a dependency of your individual Rails app and still make these modifications.