added continue shopping and checkout
working checkout, confirmation and subsequent empty cart
hides add to cart if stock is less than one
inactive products don't show in index
changed schema for retired products
updated booleans for retired products
checkout and confirm with kerri
fixed merge conflicts
merged master with orders branch
Merge pull request #25 from lizrush/orders

Orders
Merge pull request #26 from lizrush/layout

Layout
updated schema for merge
abstracted current_user in app helper