Renamed AppCache to Apps.

Also renamed app_cache to apps and "app cache" to "app registry".

Deprecated AppCache.app_cache_ready() in favor of Apps.ready().

tests/migrations/models.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.apps.cache import AppCache
+from django.apps.registry import Apps
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
 
@@ -12,7 +12,7 @@ class UnicodeModel(models.Model):
 
     class Meta:
         # Disable auto loading of this model as we load it on our own
-        app_cache = AppCache()
+        apps = Apps()
         verbose_name = 'úñí©óðé µóðéø'
         verbose_name_plural = 'úñí©óðé µóðéøß'
 
@@ -32,4 +32,4 @@ class UnserializableModel(models.Model):
 
     class Meta:
         # Disable auto loading of this model as we load it on our own
-        app_cache = AppCache()
+        apps = Apps()