Update README.txt
Add commerce_order_primary_key(), commerce_line_item_primary_key(), commerce_line_item_update(), commerce_order_update(), commerce_product_display_retrieve(), commerce_line_item_save(), commerce_product_display_load(), commerce_order_load(), commerce_order_save(), commerce_product_load() and commerce_cart_button_update_click(). Change commerce_cart_view_pageshow() to hold onto the current order in a global variable. Change commerce_services_preprocess() to handle orders and line items. Change theme_commerce_cart_line_item() to pass along order to subsequent theme functions. Change theme_commerce_cart_line_item_quantity() to use a number input. Fixed the line item remove handler.