Merge pull request #11768 from edx/jeskew/upgrade_to_django_1_8_11

Upgrade to Django 1.8.11.

common/djangoapps/monkey_patch/django_utils_http_is_safe_url.py

@@ -1,30 +0,0 @@
-"""
-Monkey patch the is_safe_url method in django.utils.http for Django 1.8.10.
-In that release, the method crashes when a bytestring, non-unicode string is passed-in
-as the url.
-Remove the monkey patch when the bug is fixed in a Django 1.8 release. Here's the bug:
-https://code.djangoproject.com/ticket/26308
-"""
-
-from django.utils import http
-from django.utils.encoding import force_text
-
-
-def patch():
-    """
-    Monkey patch the django.utils.http.is_safe_url function to convert the incoming
-    url and host parameters to unicode.
-    """
-    def create_is_safe_url_wrapper(wrapped_func):
-        # pylint: disable=missing-docstring
-        def _wrap_is_safe_url(*args, **kwargs):
-            def _conv_text(value):
-                return None if value is None else force_text(value)
-            return wrapped_func(
-                # Converted *args.
-                *tuple(map(_conv_text, args)),
-                # Converted **kwargs.
-                **{key: _conv_text(value) for key, value in kwargs.items()}
-            )
-        return _wrap_is_safe_url
-    http.is_safe_url = create_is_safe_url_wrapper(http.is_safe_url)