@dcramer, does not work to me without the tweak. Without the line, conf does not look complete and returns an error:

```
Traceback (most recent call last):
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/wsgi.py", line 25, in <module>
    from raven.contrib.django.middleware.wsgi import Sentry
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../raven/contrib/django/middleware/__init__.py", line 12, in <module>
    from raven.contrib.django.models import client
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../raven/contrib/django/models.py", line 213, in <module>
    if ('raven.contrib.django' in django_settings.INSTALLED_APPS
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../django/utils/functional.py", line 184, in inner
    self._setup()
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../django/conf/__init__.py", line 42, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../django/conf/__init__.py", line 93, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../logan/importer.py", line 68, in load_module
    return self._load_module(fullname)
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../logan/importer.py", line 92, in _load_module
    load_settings(self.config_path, allow_extras=self.allow_extras, settings=settings_mod)
  File "/usr/share/sentry/local/lib/python2.7/site-packages/sentry/../logan/settings.py", line 49, in load_settings
    execfile(mod_or_filename, conf.__dict__)
  File "/etc/sentry.conf", line 23, in <module>
    INSTALLED_APPS = INSTALLED_APPS + (
django.core.exceptions.ImproperlyConfigured: NameError("name 'INSTALLED_APPS' is not defined",)
```