Move require of select2 into spree_backend to make select2 available to extensions.
Fixing some text rendering issues that appear after updating FontAweesome

Fix select2 styles. Fix some button text rendering problems on OSX.

Fix table reorder handle align.

Fix .select2-choices background
Lockdown select2-rails temporarily.
Update select2-rails now that it has been fixed.
Put checkboxes before descriptions in shipping methods form

Fixes #3483
Fix IE8 compatibility issues with checkout.js and products.js

IE8 has a weird bug where function definitions outside of a ready statement were not being acknowledged
Set default stock location on old shipments. Fixes #3510
Use update_all to close order adjustments

That would use one single query to update all adjustments
Use a hash instead of sql fragment.
Fix broken spec.
Fix migration to run when no tax category set on product.
expand order number field size to 32
[api] Add eager loading for stock items, products, images and prices to variants#index
Dont update shipments and payment in order cart

Adding a product to cart on a fresh spree install currently runs 41 SQL
queries. This change makes the POST orders/populate request run 34 SQL
queries.

So each time the store needs to run `order.update!` and the order is not
completed yet we run 7 less queries. That could make a big difference
when lots of promotions are involved.

Fixes #3513
Drop spree_mail_methods table

It's no longer used since Spree 2.0

Fixes #3511
[backend] Add _spec suffix to stock_transfer test
Refactor and add test to Spree::Payment#set_unique_identifier.

Fixes #3493
Bump aws-sdk

Should be pretty safe, and this allows use of newer AWS services.

Change-Id: I24b4a006409f202138699d63285eee508fe86c4b

Fixes #3514
Use includes(:model) in promotion_credit_exists? check for fewer queries

Fixes #3517
override permalink of deleted product for creating new product of same name without errors