Add support to #add method return the last object added to shopping or cart_item
Add support to #add method return the last object added to shopping or
cart_item

roberttaraya/acts_as_shopping_cart,dabit/acts_as_shopping_cart,dabit/acts_as_shopping_cart,eubanksanator/acts_as_shopping_cart,crowdint/acts_as_shopping_cart,kulte/acts_as_shopping_cart,kulte/acts_as_shopping_cart,crowdint/acts_as_shopping_cart,roberttaraya/acts_as_shopping_cart,eubanksanator/acts_as_shopping_cart