`cart_name` - Name of this release cart
        `cart_description` - list of ['reponame', item1, ..., itemN] lists

def create(self, cart_name, cart_description):
        """
        `cart_name` - Name of this release cart
        `cart_description` - list of ['reponame', item1, ..., itemN] lists
        """
        cart = juicer.common.Cart.Cart(cart_name)

        # repo_items is a list that starts with the REPO name,
        # followed by the ITEMS going into the repo.
        for repo_items in cart_description:
            (repo, items) = (repo_items[0], repo_items[1:])
            juicer.utils.Log.log_debug("Processing %s input items for repo '%s'." % (len(items), repo))
            cart[repo] = items

        cart.save()
        return cart