Fix ajax calls for adding and deleting order item meta from the backend.
Check products are purchasable when restoring cart

If WC_Product::is_purchasable() is only called when adding a product to the cart,
it's possible to purchase products that aren't purchasable (but were when they were
added to the cart).
Add WC_Cart::get_cart_for_session()
Updated Danish Language files
Bracing
Fix variations not showing in all cases for draft products
Fixed field matching in setting up variations
Remove 2.0 tax deprecated arguments #4194
Remove parameters from function as well #4194
Remove safety net for calling WC_Product directly #4194
Soft bumping version to beta-1 #4194
Fixed typo as merged in #4190
Merge pull request #4181 from kloon/fix_order_item_meta_ajax

Fix ajax calls for adding and deleting order item meta from the backend.
Merge pull request #4182 from thenbrent/is-purchasable-check

Check products are purchasable when restoring cart
we jp do use states (closes #4186)
Merge branch 'master' of https://github.com/woothemes/woocommerce
Merge pull request #4189 from w-academy/master

Updated Danish Language files
Merge pull request #4192 from maxrice/http-x-forwarded-host

Allow forwarded hosts for forced SSL
PT Lang + readme
esc_attr instead of esc_url for textarea placeholder

Closes #4195