ss3.1 compabality

public variables are depressed
API replace HtmlEditorField with ElEditorField
i18n Russian
API new AccountPage
Minor fixtures
Move images to img folder
API Shipping fields param

Use config setting ShopConfig.shipping to display shipping fields
Bunch of API updates and fixes
Merge branch 'nc0.1' of https://github.com/a2nt/silverstripe-shop into nc0.1

Conflicts:
	_config/shop.yml
	code/account/AccountForm.php
	code/checkout/CheckoutForm.php
	code/checkout/CheckoutPage.php
	code/cms/ProductCatalogAdmin.php
	code/fulfilment/OrderProcessor.php
	code/product/AddProductForm.php
	code/product/Product.php
	code/product/ProductImage.php
	code/product/variations/ProductVariation.php
	lang/ru.yml
	templates/Includes/ProductGroupItem.ss