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
make sandbox shell script more resilient
correctly show variant options

Fixes #2466
Reset preferences after spec to properly teardown test and avoid files being saved where they are not gitignored.

Fixes #2467
Use pluck instead of mapping attributes for performance.

Fixes #2468
An order should be able to ship when awaiting return and in the returned state

Fixes #2444
including Spree::Core::ControllerHelpers will now include all sub-modules