order items added and nested
Removed outstanding ajax calls to be moved into other branch
White space change
Confirming that preview will work
Adding vaildations and tests for order item
More specs and the totaling on order and item
Added minimal validations for product and customer
Tidy up
Refactored tests to be dryer and added new test

Based on 0
Was getting precision errors

So am now using decimal types
Added more tests
Added seed data. 

Got bored adding a customer and prod each tiem ;-)
Updated tests
Padded out tests
Added update product to order item
Added update products to order
White space
Added the product update to the controller
Rspec
Renamed factory correctly