The old `PipelineCachedStorage` class has been removed, because Django removed the `CachedStaticFilesStorage` class. The reasoning here is that this storage backend had non-specified "intractable problems". Django advises to switch to `ManifestStaticFilesStorage`, and Pipeline does have a storage class that inherits from this. This class does the same hashing for filenames that the old cached storage does. The major difference is that it also looks for those files in the manifest file. This can be disabled via a class attribute, so I've added a subclass of it that uses the backend for its hashing but turns off manifest checking. Testing Done: Ran unit tests.