update for version 1.7.1
added Order Attributes metabox
new values are stored
added information when there are no variations in order
fixed indentation
Merge pull request #856 from piotr-szczygiel/attributes-edit

Attributes edit
Merge pull request #1 from jigoshop/dev

Dev
fixed problem with not unique IDs
Merge pull request #859 from piotr-szczygiel/dev

fixed problem with not unique IDs
added action hook
added action hook jigoshop_admin_order_item_header_before_prod_id
order attributes meta box is now extendable
added pre and post order item action hooks
Merge pull request #863 from piotr-szczygiel/product-addons-changes

Product addons changes
update for version 1.7.2
update for version 1.7.3, repair template loader
API Class