added conditional logic that excludes tax amounts when they are zero.
fixed several logic bugs related to displaying regular prices and sale prices. Made progress in displaying line items in ActiveAdmin for an order
modified order view in ActiveAdmin
Modified TODO list
added new gem Kaminari to gem file
Pagination working for main page
pagination seems to be working well
modified TODO
cleaned up product index ActiveAdmin view
made experimental modificiations for a few files
added subtotal column to order. Converted checkout process to include setting the subtotal.
Added more columns for storing totals
added order totals to order controller and activeadmin view
modified customer and order ActiveAdmin views to provide more detail