Tweaked config to ensure that consts-site.rb overrides both consts.rb and environments/#{Rails.env}.rb.
Split off image-related stuff from bash_include into bash_images.
In future, bash_images, process_image, rotate_image, retansfer_images and verify_images will all be rewritten in ruby.
All of these are currently tested separately, too, in test/unit/image_script_test.rb.