Dont let order import fail silently on bad line items.
Fix my mistakes from 933c773a234048b72fbd7cb4fccce8810ec55c83 :(
Editing a shipping method was triggering to GET requests to the edit action

Add some missing preventDefault() and 'return false'
Fixes #5412
Remove unused check that stubs out valid data.
Standardizing use of colons in checkout summary
Fixes #5413
Touch Adjustment#adjustable, and fix some rspec deprecations.
Fix broken spec.
Fix the damn taxes.  When tax adjustments are destroyed we need to set additional_tax_total & included_tax_total on items back to 0.

Fixes #5392
Small performance improvement calculating taxes.
Merge remote-tracking branch 'dev/2-3-stable' into 2-3-stable