use the more natural 'django.VERSION < (1.7)' for version tests

wagtail/tests/settings.py

@@ -76,7 +76,7 @@ INSTALLED_APPS = [
 ]
 
 # If we are using Django 1.6, add South to INSTALLED_APPS
-if django.VERSION[:2] == (1, 6):
+if django.VERSION < (1, 7):
     INSTALLED_APPS.append('south')
 
 
@@ -84,7 +84,7 @@ if django.VERSION[:2] == (1, 6):
 # Theres nothing special about wagtailredirects, we just need to have one
 # app which uses AppConfigs to test that hooks load properly
 
-if django.VERSION[:2] == (1, 6):
+if django.VERSION < (1, 7):
     INSTALLED_APPS.append('wagtail.wagtailredirects')
 else:
     INSTALLED_APPS.append('wagtail.wagtailredirects.apps.WagtailRedirectsAppConfig')

wagtail/utils/apps.py

@@ -14,7 +14,7 @@ def get_app_modules():
     Generator function that yields a module object for each installed app
     yields tuples of (app_name, module)
     """
-    if django.VERSION[:2] == (1, 6):
+    if django.VERSION < (1, 7):
         # Django 1.6
         for app in settings.INSTALLED_APPS:
             yield app, import_module(app)