Replaced remaining occurences of 'django.conf.urls.defaults'.

see #384

modoboa/core/templates/urls.py

@@ -1,4 +1,4 @@
-from django.conf.urls.defaults import patterns, include, url
+from django.conf.urls import patterns, include, url
 
 urlpatterns = patterns('',
     url(r'', include('modoboa.urls')),

modoboa/extensions/__init__.py

@@ -3,7 +3,7 @@ import os
 import sys
 import re
 from django.conf import settings
-from django.conf.urls.defaults import include
+from django.conf.urls import include
 
 
 class ModoExtension(object):

modoboa/extensions/postfix_autoreply/__init__.py

@@ -6,7 +6,6 @@ This module provides a way to integrate Modoboa auto-reply
 functionality into Postfix.
 
 """
-from django.conf.urls.defaults import include
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _, ugettext_lazy
 from modoboa.lib import events, parameters

modoboa/extensions/stats/__init__.py

@@ -9,7 +9,6 @@ sent, received, bounced, rejected
 """
 from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _, ugettext_lazy
-from django.conf.urls.defaults import *
 from modoboa.lib import events, parameters
 from modoboa.extensions import ModoExtension, exts_pool