Fix potential tax calculation issues with charging of unreturned expedited exchanges

* Test that taxes are included
* Make sure to hit all state machine transition events

Conflicts:
	core/lib/tasks/exchanges.rake

Make sure not to ship again on an unreturned expedited exchange

Conflicts:
	core/lib/tasks/exchanges.rake

Fixes #5237
Allow Product.orders

One thing that our store admins need to do often is find the orders that have been made for a given product. This can be easily achieved by adding these `has_many through:` lines. This seems like a capability that other stores might find useful as well.

Fixes #5247
Don't try to compute based upon adjustment total.
Don't try to compute based upon adjustment total. Part 2 git fail.
Update rubies for travis.
Was added options to generate_order_numer.

Fixes #5126
Fix spec.
Change order updater to refresh shipment rates and amounts on change

* This change will refresh the shipment rates and amounts when a
* completed order state changes.

  One specific example would be if the order line item quantity is
  changed in the admin menus we want the order shipment and shipping
  total to update.

Fixes #5235
Fixes #5222
refs #4428
Use retry.