StorageObjectWrapper, added with-support to CloudFilesStorageWrapper
* Removed custom `closing()` method
* Removed usage of `closing()` in process_media/__init__.py
* Renamed StorageObjectWrapper -> CloudFilesStorageObject wrapper
In my first version of the StorageOjbectWrapper it was located
inside the CloudFilesStorage object, things have changed since
then but there has been no renaming, thank you Elrond for the
good point.
* CloudFilesStorageObjectWrapper now supports context manager
methods such as `__enter__()` and `__exit__()` (and `close()`)
c2b862d134