Fix initialize import for Django < 1.7

Fixes #1013 (honest!)

Author: tomkins

raven/contrib/django/__init__.py

@@ -7,13 +7,6 @@
 """
 from __future__ import absolute_import
 
-import django
-
 default_app_config = 'raven.contrib.django.apps.RavenConfig'
 
 from .client import DjangoClient  # NOQA
-
-# Django 1.8 uses ``raven.contrib.apps.RavenConfig``
-if django.VERSION < (1, 7, 0):
-    from .models import initialize
-    initialize()

raven/contrib/django/models.py

@@ -15,6 +15,7 @@
 import sys
 import warnings
 
+import django
 from django.conf import settings
 from django.core.signals import got_request_exception, request_started
 from threading import Lock
@@ -270,3 +271,7 @@ def initialize():
             get_client()  # NOQA
         except Exception:
             _initialized = False
+
+# Django 1.8 uses ``raven.contrib.apps.RavenConfig``
+if django.VERSION < (1, 7, 0):
+    initialize()