feature: RequestCookie Identifier and Caching storage

* New Identifier: requestcookie (choose for storage: cache, the session
will be expired), the cart could be reloaded from a http request,
example: the customer could save his cart link (email, hyperlink) and
reopen this later.
If there is no request, the cookie will be loaded.
* New Storage: Laravel Caching
* Config file
* Future new storage, Laravel Database: eloquent setup, Cart + Tax tables?