#list_redeemable_by_email
Spree::GiftCard#find_by_code is case insensitive
#find_by_code should return the first record only
Merge branch '1-3-stable' into fix/accept-amount

* 1-3-stable:
  #find_by_code should return the first record only
  Spree::GiftCard#find_by_code is case insensitive
  #list_redeemable_by_email