Remove the dependency on django-secure

django-secure was merged into Django 1.8, and since rtd.org uses
Django 1.9, migrating to using the built-in checks reduces the
dependency list and avoids any problems between newer versions
of Django and django-secure.

https://github.com/carljm/django-secure
https://docs.djangoproject.com/en/1.8/releases/1.8/#security-enhancements

Author: alexwlchan

readthedocs/settings/base.py

@@ -68,7 +68,6 @@ def INSTALLED_APPS(self):  # noqa
             # third party apps
             'linaro_django_pagination',
             'taggit',
-            'djangosecure',
             'guardian',
             'django_gravatar',
             'rest_framework',
@@ -125,7 +124,7 @@ def INSTALLED_APPS(self):  # noqa
         'readthedocs.core.middleware.FooterNoSessionMiddleware',
         'django.middleware.locale.LocaleMiddleware',
         'django.middleware.common.CommonMiddleware',
-        'djangosecure.middleware.SecurityMiddleware',
+        'django.middleware.security.SecurityMiddleware',
         'django.middleware.csrf.CsrfViewMiddleware',
         'django.contrib.auth.middleware.AuthenticationMiddleware',
         'django.contrib.messages.middleware.MessageMiddleware',

requirements/pip.txt

@@ -46,7 +46,6 @@ pytz==2013b
 beautifulsoup4==4.1.3
 Unipath==0.2.1
 django-kombu==0.9.4
-django-secure==0.1.2
 mimeparse==0.1.3
 mock==1.0.1
 stripe==1.20.2