Some things, like CSRF protection (`#361 </issues/361>`_), benefit
from the ability to uniformly call helpers before and after a
request is processed by the view. In the case of CSRF, we want to
confirm that the token matches before processing the view, and make
sure the token is set before delivering the response. Unlike WSGI
middleware, this sort of wrapping is an integral part of the
application.

As I don't have any simple way to test cloud storage, I'm filing
this as a bug.


1. StorageObjectWrapper should have a close() method
2. ``process_media/__init__.py`` should use the real ``closing()``
   function from ``contextlib`` instead of the current dummy one.

I would also suggest to rename StorageObjectWrapper to include
something about CloudFiles.

Not sure when this started happening:

::

    ...........................E..................
    ======================================================================
    ERROR: mediagoblin.tests.test_submission.TestSubmission.test_delete
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/home/cwebber/devel/mediagoblin/eggs/nose-1.1.2-py2.6.egg/nose/case.py", line 197, in runTest
        self.test(*self.arg)
      File "/home/cwebber/devel/mediagoblin/mediagoblin/tests/test_submission.py", line 188, in test_delete
        media = request.db.MediaEntry.find({'title': 'Balanced Goblin'})[0]
      File "build/bdist.linux-i686/egg/pymongo/cursor.py", line 388, in __getitem__
        raise IndexError("no such item for Cursor instance")
    IndexError: no such item for Cursor instance