SessionSingleton Session Tweaks

- './header.php' no longer ignores PHP notices; previously used to
ignore 'session has already been been started; ignoring second session
start' notices
- './php/SessionSingleton.php' now checks if a session has been started
before starting the session; does not start a session is one already
exists
- './php/SessionSingleton.php' no longer closes the session when it is
finished using it
SessionSingleton

- './php/SessionSingleton.php' no longer sets error reporting to ignores
notices
CartManager QA Test Tweaks

- './test/CartTestExample.php' now clears the cart when finished testing
CartManger QA Tweaks

- './test/CartTestExample.php' no longer adds items to the cart; the
current cart is printed instead ( add items to the cart via mens.php )
- './test/CartTestExample.php' PHP settings via phpinfo()
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'
Merge pull request #6 from uptownjimmy/cartfunctionality

Cartfunctionality