never start a gift card code with a zero
Migration: Add liability and expires_at to gift card
Ability to edit liability and expires_at at admin
Scopes to unexpired gift code and get total liability
Merge pull request #1 from surenm/liability

Gift card improvements
fix for users accidentally adding whitespace to their codes
removed user facing gift card creation page
disable user facing card creation, added prefix to gift card numbers, disable check for order created after gift card, and check if card was created by admin or a complete order when validating
merge master
wired up user facing gift card purchase page
fixed routes typo