Add stripe update request

Author: pilot

src/Omnipay/Stripe/Gateway.php

@@ -59,6 +59,11 @@ public function store(array $parameters = array())
         return $this->createRequest('\Omnipay\Stripe\Message\StoreRequest', $parameters);
     }
 
+    public function update(array $parameters = array())
+    {
+        return $this->createRequest('\Omnipay\Stripe\Message\UpdateRequest', $parameters);
+    }
+
     public function unstore(array $parameters = array())
     {
         return $this->createRequest('\Omnipay\Stripe\Message\UnstoreRequest', $parameters);

src/Omnipay/Stripe/Message/UpdateRequest.php

@@ -21,6 +21,13 @@ public function getData()
         $data = array();
         $data['description'] = $this->getDescription();
 
+        if ($this->getCardToken()) {
+            $data['card'] = $this->getCardToken();
+        } elseif ($this->getCard()) {
+            $data['card'] = $this->getCardData();
+            $data['email'] = $this->getCard()->getEmail();
+        }
+
         $this->validate('cardReference');
 
         return $data;