Update compat.py for django 1.7 compatibility

[chicagobuss]

Fix for django 1.7 error:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/graphite/webapp/graphite/render/views.py", line 207, in renderView
    response = HttpResponse(content=result, mimetype='application/json')
  File "/opt/graphite/webapp/graphite/compat.py", line 10, in __init__
    super(ContentTypeMixin, self).__init__(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/http/response.py", line 318, in __init__
    super(HttpResponse, self).__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'mimetype'

Based on findings from this thread where "mimetype" has once again been swapped out in favor of "control_type" in 1.7: caffeinehit/django-oauth2-provider#77

[chicagobuss]

any new on this? still pretty annoying :(

[brutasse]

There was no swap with Django 1.7. Looking at the code I don't see the offending line either in master or in 0.9.x. Which version are you running?

[obfuscurity]

No updates or responses to @brutasse's question, closing.