Fixed admin bug with payment models

oscar/apps/address/abstract_models.py

         """
         Clean up fields
         """
-        self.first_name = self.first_name.strip()
         for field in ['first_name', 'last_name', 'line1', 'line2', 'line3', 'line4', 'postcode']:
             if self.__dict__[field]:
                self.__dict__[field] = self.__dict__[field].strip()

oscar/apps/payment/admin.py

 models = import_module('payment.models', ['Source', 'Transaction', 'SourceType'])
 
 class SourceAdmin(admin.ModelAdmin):
-    list_display = ('order', 'type', 'amount_allocated', 'amount_debited', 'balance', 'reference')
+    list_display = ('order', 'source_type', 'amount_allocated', 'amount_debited', 'balance', 'reference')
+
 
 admin.site.register(models.Source, SourceAdmin)
 admin.site.register(models.SourceType)

oscar/apps/payment/models.py

 from oscar.apps.payment.abstract_models import *
 
+
 class Source(AbstractSource):
     pass
 
+
 class SourceType(AbstractSourceType):
     pass
 
+
 class Transaction(AbstractTransaction):
     pass
 
+
 class Bankcard(AbstractBankcard):
     pass