Add onSale flag to ProductList (view) and ProductVariantList (view)
Merge branch 'feature/extended-product-views' of https://github.com/opmaat/Merchello into opmaat-feature/extended-product-views
Merge remote-tracking branch 'merchello/1.4.1' into 1.4.1
Merge pull request #908 from rustyswayne/1.4.1

Merges @opmaat pull that adds "Product On Sale" column to product catalog list view.