#440 - Added first name and last name to registration forms. Updated styles for address form. Added billing address toggle.
Rendering percentage discount ONLY on the items total (on not the whole order total)
Promotion coupon integration
Removing coupon handler and using CodeToCoupon form
Dispatching events related to coupons Fixing CS and glitches
Handling flash messages related to coupons thanks to SyliusPromotionsEvents. Fixing CS
Added translation.
Added validation for first/last name. Updated registration scenarios.
Fixing specs and CS, cleaning code and tests cleaning after reviews
Fix permissions
Merge pull request #429 from jjanvier/feature/coupons-integration

[WIP] Integrate the promotion coupons
Merge pull request #449 from phpfour/registration-form-enhancement

#440 - Added first name and last name to registration forms. Updated styles of address form.
Renaming SalesBundle to OrderBundle
Fixing last glitches