Use the json module as fallback for simplejson, and #4
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remove the hard dependency on simplejson.
The motivation for this is that simplejson is not required, and
it causes problems with Django 1.5 (see
simplejson/simplejson#37).
For most cases, the speedup of simplejson is not required, and if
the system does not have a C compiler, simplejson is actually slower
than the json module (see https://code.djangoproject.com/ticket/18023).