Add total_quantity field for tracking the total sum of items.quantity in your cart
Add 3 new methods for tracking cart total quantity into CartInterface
Doc & {} around loop block
Merge branch 'master' of git://github.com/Sylius/SyliusCartBundle

Conflicts:
	spec/Sylius/Bundle/CartBundle/Model/Cart.php
Merge pull request #33 from mykehsd/master

Tracking total quantity of cart items