Fix use \Thelia\Model\OrderStatus constants
	modified:   Controller/ConfigurePaypal.php
	modified:   Controller/PaypalResponse.php
	modified:   Form/ConfigurePaypal.php
	modified:   Form/ConfigureSandboxPaypal.php
	modified:   Model/ConfigInterface.php
	modified:   Model/PaypalConfig.php
	modified:   Paypal.php
Fix error using OrderStatus code instead of ID
	modified:   Controller/PaypalResponse.php
Fix bug, compute cart price to get if paypal is usable to pay
	modified:   Paypal.php
Merge pull request #3 from lovenunu/master

Fix use \Thelia\Model\OrderStatus constants