Large update for version 2.0

src/Exceptions/CartAlreadyStoredException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Gloudemans\Shoppingcart\Exceptions;
+
+use RuntimeException;
+
+class CartAlreadyStoredException extends RuntimeException {}

src/Exceptions/InvalidRowIDException.php

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+<?php
+
+namespace Gloudemans\Shoppingcart\Exceptions;
+
+use RuntimeException;
+
+class InvalidRowIDException extends RuntimeException {}

src/Exceptions/UnknownModelException.php

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+<?php
+
+namespace Gloudemans\Shoppingcart\Exceptions;
+
+use RuntimeException;
+
+class UnknownModelException extends RuntimeException {}