Updated routes.rb to use :add_routes for 2.1

Fixes #149
Version 2.2.0
Redid the product packages admin interface. Brought it up to the new admin standard from 1.3.

The new and edit commands function like the images new command.

Wasn't a clean merge because of the Spree 2.0 translations

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>

Conflicts:
	app/controllers/spree/admin/product_packages_controller.rb
	app/models/spree/product_decorator.rb
	app/views/spree/admin/product_packages/index.html.erb
	config/locales/en.yml
Updated the settings pages to the new UI standard introduced in Spree 1.3.

Merge wasn't clean again due to spree translations.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>

Conflicts:
	app/overrides/add_active_shipping_settings_tab.rb
	app/views/spree/admin/active_shipping_settings/edit.html.erb
	app/views/spree/admin/active_shipping_settings/show.html.erb
	config/locales/en.yml
Added an icon to the product packages tab entry.

I think the truck fits better than a barcode.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>

Conflicts:
	app/overrides/add_packages_tab.rb
Gave the readme a long need updated.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>

Conflicts:
	README.md
remove pry require from the specs

Fixes #145
Fixed test to not reference the show route for the settings page.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>

Fixes #154
Added USPS First Class Package International Service