Adding sale price overrides
Made item_added override to work on variant level

	modified:   app/views/spree/shared/_original_price_display_item_added.html.erb
Added a variant discount percentage

	modified:   app/helpers/spree/products_helper_decorator.rb
Added variant discount percentage; percent off to orders edit
Merge pull request #3 from deseretbook/kl0Ml4mh-spree-sale-pricing-sitewide

Spree sale pricing sitewide