A collection a django backends for the Google App Engine

Features:
- memcache/datastore session backend
- email backend
- cache backend

TODO:
- file storage base in the Google Cloud Storage

Setup
=====
Add to the settings.py the following lines to install the backends:

SESSION_ENGINE = "gae_backends.sessions.cached_db"
EMAIL_BACKEND = "gae_backends.mail.EmailBackend"
CACHES = {
    'default': {
        'BACKEND': 'gae_backends.memcache.MemcacheCache',
    }
}