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

Conflicts:
	app/serializers/spree/wombat/shipment_serializer.rb
it's line_items here
uncomment variant and product images