code: def create_manifest(self, cart_name, manifests):
          
          cart = juicer.common.Cart.Cart(cart_name)
  
          for manifest in manifests:
              cart.add_from_manifest(manifest, self.connectors)
  
          cart.save()
          return cart
docs: `cart_name` - Name of this release cart
          `manifests` - a list of manifest files