Fix quickstart permission classes setting

'DEFAULT_PERMISSION_CLASSES' had resulted in:

Environment:


Request Method: GET
Request URL: http://localhost:8000/users/

Django Version: 1.7.1
Python Version: 2.7.6
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django_extensions',
 'rest_framework',
 'debug_toolbar')
Installed Middleware:
(u'debug_toolbar.middleware.DebugToolbarMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')


Traceback:
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
  57.         return view_func(*args, **kwargs)
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/rest_framework/viewsets.py" in view
  79.             return self.dispatch(request, *args, **kwargs)
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  406.             response = self.handle_exception(exc)
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  394.             self.initial(request, *args, **kwargs)
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/rest_framework/views.py" in initial
  324.         self.check_permissions(request)
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/rest_framework/views.py" in check_permissions
  280.         for permission in self.get_permissions():
File "/Users/chrstphrhrt/Documents/code/venvs/test-drf/lib/python2.7/site-packages/rest_framework/views.py" in get_permissions
  233.         return [permission() for permission in self.permission_classes]

Exception Type: TypeError at /users/
Exception Value: 'type' object is not iterable

docs/tutorial/quickstart.md

@@ -122,7 +122,7 @@ We'd also like to set a few global settings.  We'd like to turn on pagination, a
     )
 
     REST_FRAMEWORK = {
-        'DEFAULT_PERMISSION_CLASSES': ('rest_framework.permissions.IsAdminUser',),
+        'PERMISSION_CLASSES': ('rest_framework.permissions.IsAdminUser',),
         'PAGINATE_BY': 10
     }