fix cart item prices when not on default currency
escape smarty variables
Merge pull request #346 from lunika/dev

escape smarty variables
refactore currency calculations in ProductSaleElements
unnecessary code removed
Merge pull request #344 from bibich/fix-cart-currency

fix cart item prices when not on default currency
add discount input on customer form
use customer permanent discount
Merge branch 'permanentDiscount' of github.com:lunika/thelia into permanentDiscount