Revert "Remove call to authorize! which is actually not doing anything"

Need to call authorize with :admin to prevent index on Product which is
allowed in the ability here:

https://github.com/spree/spree/blob/master/core/app/models/spree/ability.rb#L57

NOTE: The ability intends the permission for the front_end but it
applies to the back end also.

This reverts commit a1d2e6f018858ad8d7a7b5cdd7f77307962feff3.

Conflicts:
	core/app/controllers/spree/admin/base_controller.rb
	core/lib/spree/core/testing_support/authorization_helpers.rb
Adding additional common Bogus Credit Card Numbers

Fixes #2543
Require spree_auth_devise 1-3-stable in extensions
Ensure json gem version is at least 1.5.5 [Thanks to Steve Root for
notifying us of this]
Ensure state dropdown reappears during country selection, as required. Fixes #2605
Fix route reference in shared/_alert so that it can be shared

Causes errors in custom admin sections otherwise.

Fixes #2564
orders api now returns its variants product id and description #2561
prefixed root_path with spree to make compatable with extensions

Fixes #2577
Fixes first order promotion rule

The previous logic applied to this rule prevented it from being eligible
in any context

Fixes #2569
Define group_by_products_id as a method so its existence isn't dependent on the table existing

Fixes #1247
[promo] Remove dependency on yaml fixtures
Just stub authorize! within testing_support/authorization_helpers
Only return unique ids from selected_taxons
Index shipments by order_id

Fixes #2594
count_on_hand setter no longer is accessible

Setting this attribute should be done through update_column instead, because otherwise this attribute is recalculated using recalculate_count_on_hand
Add closing tag for actions in admin/countries/index

Fixes #2615
now the taxons creation API works as documented

Fixes #2591
fix : ability params[:action] should be a symbol https://github.com/ryanb/cancan/wiki/Fetching-Records

Fixes #2609
not_deleted should include products 'deleted' in the future
Fix per item calculator to work when no promotion rules.

Fixes #2610