Fixed several css issues in the backend builder.
Added clear support for radio and thumbnail modes in product element.
Fixed an issue where checkboxes were always marked as checked in the builder.
Fixed compatibility with Composite Products.
Fixed an issue where editing product in the cart was removing the product from the cart.
Fixed compatibility with WPML.
Fixed an issue were wrong prices were being calculated when using price types based on quantity.
Fixed an issue where the quantity selector were not working correctly.
