fix urls import for django 1.6

cartero/admin.py

@@ -2,10 +2,10 @@
 #from django.contrib.gis import admin
 from django.contrib import admin
 #from mptt.admin import MPTTModelAdmin
-from django.utils.translation import ugettext_lazy as _ 
+from django.utils.translation import ugettext_lazy as _
 from cartero.models import Contact, EmailTemplate, Campaign, ExcludedEmail,\
         ShortURL, LinkClick, OpenEmail, Image
-from django.conf.urls.defaults import patterns, include, url
+from django.conf.urls import patterns, include, url
 from cartero.views import CreateTemplateView, UpdateTemplateView
 from cartero.utils.sending import CampaignDeliver
 from django.db.models import Count