[api] Return relative attachment url for product images
correction translation missing

Fixes #2463
edited admin/shipping_methods.js to be more explicit when manipulating checkbox inputs so that additional checkboxes are not affected

Fixes #2465
Don't change Property's presentation name if it's already set

Fixes #2455
Removes adjustments from incomplete orders

Every time a promotion is removed its adjustments should be removed from
incomplete orders

fixes #1046

fixes #2453
Adding adjustments to Orders Show

Fixes #2449
Adding Credit Cards to API

Fixes #2449
Remove guard dependencies
Add a test for adjustments + credit_cards

Related to #2449