Removing non existent items from params to avoid bug when clicking on remove multiple times or when clicking on multiple remove buttons

Fixes #5304
Closes #5305
Simple fix for payment source.

Steps to reproduce the issue:

1. Add an order through the admin interface
2. Attempt to pay via cheque for a user who has a credit card number
stored in their profile.
3. Submit the form

This will 500, because params[:card] is set from the form on the initial
page for the radio button from the credit card profiles.

This is a simple, though incomplete fix for the issue. A proper fix
would be to change the form so that params[:card] is qualified by the
payment_method which it belongs.

There are also likely issues with multiple payment methods which support
profiles, as there is likely to be confusion between them. This should
suffice for now.

Fixes #5209
keep the simple_current_order simple :)
Fix spec.
Revert "Removing non existent items from params to avoid bug when clicking on remove multiple times or when clicking on multiple remove buttons"

This reverts commit 466b3fecf71bc38714dd637e04a5bd4ac0a6cc5d.

This commit broke the build.
Fixes regressions in sprockets >= 2.1.4

Fixes #5311
Fixes #5313
Removing non existent items from params to avoid bug when clicking on remove multiple times or when clicking on multiple remove buttons

Skipping filter if there is only one line item being updated

Fixing order controller spec

Dealing with case when line items attributes is nil

Fixes #5318
Fix item_adjustment_spec.rb

Test after tax_adjustments callback instead of after promo_adjustments, which was testing a few lines earlier
Fixes #5320
Only cancel cancellable shipments.

Fixes #5321
Fixes #5299
Update Ruby hash syntax to 1.9

Create Spree::Core::ControllerHelpers::StrongParameters test
Fixes #5322
Allow partial emails when searching for orders
Fixes #5314
:scissors:
Merge pull request #5324 from camelmasa/refactor-shipment_handler

Refactor Spree::ShipmentHandler
corrects fetch_cart urls
Fixes #5325
removes window.location.origin

isn't compatible with Internet Explorer

Fixes #5323
Revert "Only cancel cancellable shipments."

This reverts commit d870c4e316e3aad6f63c728d224f6a16d4edde57.
Fix form fields.
Bootstrapping Email HTML templates.
Fix email specs.
Add test rake task and refactor layout.