Update jquery dep. refs #3203
RSpec 3.1 support & Fix a couple Rails 4.1.6 regressions.

Conflicts:
	api/spec/controllers/spree/api/base_controller_spec.rb
	api/spec/controllers/spree/api/promotion_application_spec.rb
	api/spec/controllers/spree/api/promotions_controller_spec.rb
	common_spree_dependencies.rb
	core/spec/lib/spree/core/controller_helpers/search_spec.rb
	core/spec/lib/spree/core/controller_helpers/store_spec.rb
	core/spec/lib/spree/core/controller_helpers/strong_parameters_spec.rb
	core/spec/models/spree/customer_return_spec.rb
	core/spec/models/spree/order/checkout_spec.rb
	core/spec/models/spree/order/payment_spec.rb
	core/spec/models/spree/order_spec.rb
	core/spec/models/spree/promotion/actions/free_shipping_spec.rb
	core/spec/models/spree/promotion_spec.rb
	core/spec/models/spree/reimbursement/reimbursement_type_validator_spec.rb
	core/spec/models/spree/reimbursement_type/credit_spec.rb
	core/spec/models/spree/reimbursement_type/original_payment_spec.rb
	core/spec/models/spree/return_item/default_eligibility_validator_spec.rb
	core/spec/models/spree/return_item_spec.rb
require at least one valid payment on transition to complete
Fixes #5350
Always lock payment as processing for credit action
Raise an error if payment is already processing.
Set back to completed.
Reduce queries whenever _products are rendered.
Fixes #5352
Fix spec.
let value have validation of db column length

need to rescue AR issue for spree install, ci, etc (chicken and the egg issue)

do validations as a re-useable validtor

explicit argument error message
Fixes #5361
Add circleci setup
Refactor Spree::ProductHelper#variant_price_diff

* Change the logic of the code to make it easier for the next
  commit.
* Remove duplicate code from the HTML generation.
Change #variant_price_diff to handle when the product amount is nil
Change #current_order to always lock the order when querying

* I believe some of the problem with the deadlocks is happening because
  of inconsistent locking, and updating without acquiring a lock properly. As a
  test I am going to enable it across the board and see how things perform.

Conflicts:
	core/lib/spree/core/controller_helpers/order.rb
	frontend/app/controllers/spree/checkout_controller.rb
Add inverse_of for more associations involved in cart processing

Conflicts:
	core/app/models/spree/return_authorization.rb
	core/app/models/spree/zone.rb
	core/app/models/spree/zone_member.rb
Add validations to stock items and stock movements
Change Spree::OrderUpdater#update to be performed inside a transaction
Fix spec formatting and spelling
Refactor CreateItemAdjustments#perform to not use an unscoped query

* The previous query for adjustments would return every adjustment for every
  order's line items. This would then result in a huge list of ids passed into
  the NOT IN clause, causing a huge generated SQL query to be executed.
* Refactor code to be simpler
Add adjustment total to the order summary
Change adjustments controller to only display eligible adjustments