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.
fix regexp for credit card, also set month only if regexp is correct

Closes #5427
correct for value to match input id

Closes #5424
Closes #5422
User store location when signing in
Fixes #5418
Fixes #5125

Conflicts:
	core/lib/spree/core/controller_helpers/auth.rb
Fix specs broken by 09ccf8a
Fix specs broken by 87b3fa6
Include all adjustments in final shipment price

(Not solely promotions and taxes.) As per discussion in https://github.com/spree/spree/issues/5415

Fixes #5415
Fixes #5419
Fix broken specs from 4441fb42acfbf7ebf02a44c116f0d09d61c3b54f & c3a741c
refactor shipping calculator compute methods

clearer naming for methods

Fixes #5414
fix spec path in readme
Fixes #5423
refactoing code to call find_adjustment in before_action rather than calling it in each menthod
Fixes #5426
Add spec to ensure adjustment callback is fired.