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.

Make it so that each StorageInterface implementation has it's own
submodule.

e.g.

::

    - mediagoblin/  
        - storage/  
           - cloudfiles.py  
           - mountstorage.py  
           - basicfile.py

The tag specifies that the image is to be displayed rotated and
how.

The tag is supported by:


-  MediaWiki (it generates thumbnails already rotated).
-  digiKam (there is an option to set Orientation after rotating an
   image)
-  Geeqie (rotates for displaying)
-  Nautilus
-  Eye of GNOME
-  Thunar
-  exiftran (according to the man page)