Added "exclude" parameter to form_hidden_field
Added "product" parameter
Merge pull request #76 from bibich/improvements

Updated doc for visible argument for image and document loop
Merge pull request #77 from bibich/improvements

Oops, fixed default argument value for visible in image/document loop
Merge branch 'master' into sales
Added `new`, `promo` and `default` params to `product_sale_element` loop
add order_product_tax.md
add declaration
Merge pull request #79 from zzuutt/add-loop-OrderProductTax

add order_product_tax.md
Merge pull request #78 from roadster31/sales

Finished sales documentation
Added doc related to virtual products