Created Class CartManager

- Created Cart/CartManager.php; singleton class used to keep track of
items in a shopping cart
- Included Cart/CartManager.php in header.php
- header.php now initializes and echos the CartManager object if the
user is logged in
Merge remote-tracking branch 'origin/master' into cartfunctionality
Cart/cart_add_item.php

- Added CartManager::getItems; returns the list of items currently
stored in the cart
- Created Cart/cart_add_item.php; adds an item to the cart; currently
uses hardcoded item id
cart.php

- cart.php now utilizes Cart/CartManager.php
- cart.php now generates a html form for removing items from the cart
- cart.php now stores the index of the item in a hidden form field
cart_remove_item.php

- Created Cart/cart_remove_item.php; can be called via AJAX to remove an
item from the cart
Cart Add Item Ajax

- Created js/mylibs/lacy.lib.js; binds event handlers to DOM
- footer.php now includes js/mylibs/lacy.lib.js
- Cart/cart_add_item.php now returns the CartManager object as a string
when successful; used to update quantity on screen
- the Cart anchor tag in header.php now has an id; 'cartmgr'
Merge pull request #3 from uptownjimmy/cartfunctionality

Cartfunctionality