Update plugin for future Ruby versions

[martinmalek]

-VirtualBox:~/Source/email/fetcher$ rails generate fetcher_daemon mail
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released.

[martinmalek]

Note that this occurs after installing fetcher using as:

rails plugin install git://github.com/look/fetcher.git