README.md

This provides an .optim method for Dragonfly.

This requires you have the 'image_optim' gem in your Gemfile

dragonfly.rb

Dragonfly.app.configure do
  processor :optim do |content|
    io = ImageOptim.new
    optimized = io.optimize_image(content.path)
    optimized.nil? ? content : optimized
  end
end