Remove swp file
Finished iteration C5. Add tests for store controller. Add caching.
Finished iteration D3. Added cart and line items. Added button to add item to cart and show a rudimentary cart view.
Finished iteration E1. Group line items by product ID, keeping track of the quantity in a field. Update controller to make use of this info. Update view to show item quantities. Add migration to combine and uncombine line items in the cart data.