Add issue numbers to paperclip 'undefined method processors' error changelog entry
Remove t() helper override

All spree core codebase now uses Spree.t() so I think we can safely
remove it. Plus I don't believe it's a good idea to throw warning every
time t() is called. Spree extensions or even other libraries can just
choose not to use Spree.t() at all. I don't think we should force then
to.

Fixes #3083
Remove order.update_totals from order.payment_required?

Instead we can call `order.update_totals` on the checkout_flow block
only since that's the only place on the code base where it seems to be
necessary. Plus calling `order.update_totals` generates a whole bunch of
work users may really not need or expect when calling
`order.payment_required?`

Fixes #3086
Fixes #3040
Use change method to trigger use_billing_address

That should prevent the shipping address form being hidden when the
browser autocompletes the form.

[Fixes #3068]

Fixes #3085
Merge git://github.com/spree/spree

Conflicts:
	core/app/helpers/spree/base_helper.rb