Removed django.utils.simplejson as per deprecation TL.

django/utils/simplejson.py

-# Django 1.5 only supports Python >= 2.6, where the standard library includes
-# the json module. Previous version of Django shipped a copy for Python < 2.6.
-
-# For backwards compatibility, we're keeping an importable json module
-# at this location, with the same lookup sequence.
-
-# Avoid shadowing the simplejson module
-from __future__ import absolute_import
-
-import warnings
-warnings.warn("django.utils.simplejson is deprecated; use json instead.",
-              DeprecationWarning, stacklevel=2)
-
-try:
-    import simplejson
-except ImportError:
-    use_simplejson = False
-else:
-    # The system-installed version has priority providing it is either not an
-    # earlier version or it contains the C speedups.
-    from json import __version__ as stdlib_json_version
-    use_simplejson = (hasattr(simplejson, '_speedups') or
-        simplejson.__version__.split('.') >= stdlib_json_version.split('.'))
-
-# Make sure we copy over the version. See #17071
-if use_simplejson:
-    from simplejson import *
-    from simplejson import __version__
-else:
-    from json import *
-    from json import __version__