Stripping port-info from PayPalNVP ipaddress field

This is necessary to avoid errors from postgres backends.

paypal/pro/models.py

@@ -59,7 +59,7 @@ class Meta:
 
     def init(self, request, paypal_request, paypal_response):
         """Initialize a PayPalNVP instance from a HttpRequest."""
-        self.ipaddress = request.META.get('REMOTE_ADDR', '')
+        self.ipaddress = request.META.get('REMOTE_ADDR', '').split(':')[0]
         if hasattr(request, "user") and request.user.is_authenticated():
             self.user = request.user