Set shipping address from order in ShipmentSerializer
Add Required, Optional Config
Add additional enable_auto_push config and rename enable_hub to enable_push
Update README
Fix specs
OrderSerializer sets json root to 'carts' if order state is not complete
utc updated at, sliding placed_on logic
Closes #23
update readme to point to the (wip) spree_hub_handlers extension
Make order[:adjustments] closer to what hub expects

Before it would only link adjustments directly associated with the order

Fixes #29

Conflicts:
	spec/serializers/spree/hub/order_serializer_spec.rb
point to 2-2-stable spree
don't push cart objects based on the completed state. Could be canceled as well for example. This can be best solved in the hub.
use the address associated with the shipment
add set_inventory_handler
add add_shipment_handler
implemented the add_shipment with few specs. need more edge case testing though