Add item_inventory_units method in add customer return handler
Merge pull request #34 from bonobos/item_inventory_units_method

Add item_inventory_units method in add customer return handler
Improves Spree::Wombat::Response serializer to handle objects
Merge pull request #35 from spree/responder-objects

Improves Spree::Wombat::Response serializer to handle objects
Add dimensions.
Build image so its not created until save!  is called.
Cleanup image import to handle filename through paperclip.
use method for items on shipment so we can override this
don't update last_pushed_timestamps until batch push completes
Fixes #37
Source isnt always credit card. Fixes #26
Name is optional as well.
make sure we serialize the id as well on the line_items since wombat requires at least an id on objects.
Add id for payment data
Fixes #41
Correct spec to use InventoryUnitSerializer like the ShipmentSerializer actually uses.
Dont set order#placed_on unless completed_at present & add Order totals & billing address to shipment.
allow filter scope with joins
Fixes #43
Try to send iso if available.
not needed to call the serializer explicit.
Make sure order updates itself after shipment handlers run.
Allow Spree::StockLocation and Spree::ShippingMethod to also be found by admin name.