Update request parameter requirements (#88)

Updated the parameter-fields according to the documentation. [Link to documentation](https://payment-services.ingenico.com/int/en/ogone/support/guides/integration%20guides/directlink/request-a-new%20order#requestparameters)
Brought up in #87

lib/Ogone/AbstractPaymentRequest.php

@@ -189,7 +189,7 @@ public function setEmail($email)
 
     public function setOwnerAddress($owneraddress)
     {
-        if (strlen($owneraddress) > 35) {
+        if (strlen($owneraddress) > 50) {
             throw new InvalidArgumentException("Owner address is too long");
         }
         $this->parameters['owneraddress'] = $owneraddress;
@@ -226,6 +226,9 @@ public function setOwnerCountry($ownercountry)
      */
     public function setOwnercty($ownercty)
     {
+        if (strlen($ownercty) > 2) {
+            throw new InvalidArgumentException("Owner country code is too long");
+        }
         if (!preg_match('/^[A-Z]{2}$/', strtoupper($ownercty))) {
             throw new InvalidArgumentException("Illegal country code");
         }