This adds a watermarking processor to spree product images.
When the image is processed by paperclip, it will also be watermarked
with the watermark images (if it exists) located at
named for the image size (large.png, product.png, small.png, tiny.png).
gem 'spree_watermark' to your gem file and place your watermark images
NOTE: BY DEFAULT, THIS WILL FORCE ALL OF YOUR ASSETS INTO PNG. YOU WILL NEED TO CUSTOMIZE AS BELOW TO CHANGE THIS BEHAVIOUR.
app/models/image_decorator.rb in your main app and plug in your own
Copyright (c) 2011 Azimuth Internet Services & Christopher Maujean, released under the New BSD License