CartManager QA Tweaks

- Created './test/CartRemoveItemTest.php'; the url to test this script
can be found in the test script itself
- Removed test code from './php/cart/cart_add_item.php'
- Removed test code from './php/cart/cart_remove_item.php'
- Removal of an item from the cart can be tested via running
'./test/CartRemoveItemTest.php'
- Items can be added to the cart via GUI when viewing './mens.php'