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- Support upload_to parameter (#3, #13)
- Support upload_subfolder returning strings instead of lists (#5, #11)
- Avoid restoring the deprecated get_directory_name() and get_filename()
  functions that were deprecated as of Django 1.0 and removed in Django 2.0
  Instead, generate_filename() was updated to support the recent Django
  behavior

Using user.is_authenticated() and user.is_anonymous() as a method is deprecated since Django 2.0

FileField methods get_directory_name() and get_filename() was deprecated in Django 2.0, so adding them manually to keep support of previous Django versions.

The serve method of the DjangoStreamingServer class support
If-Last-Modified, and for this it requires a timestamp of the last
modified time of the private file. Python 3 datetimes have a
timestamp method, which is used to generate the required timestamp,
but this isn't available in Python 2. Serving files on S3 therefore
fails if Python 2 is used.

This commit adds an alternative means of generating the timestamp
if Python 2 is used.

Django Version:	1.11.6
Exception Type:	UnicodeDecodeError
Exception Value:	
'ascii' codec can't decode byte 0xd1 in position 0: ordinal not in range(128)
Exception Location:	../site-packages/django/core/files/storage.py in get_available_name, line 79

Update documentation on sending files, given that ``wsgi.file_handler`` support lives in Djagno 1.8+

Supports:
- AWS_PRIVATE_S3_ACCESS_KEY_ID / AWS_PRIVATE_ACCESS_KEY_ID / AWS_S3_ACCESS_KEY_ID / AWS_ACCESS_KEY_ID
- AWS_PRIVATE_S3_SECRET_ACCESS_KEY / AWS_PRIVATE_SECRET_ACCESS_KEY / AWS_S3_SECRET_ACCESS_KEY / AWS_SECRET_ACCESS_KEY

This is needed to fetch content from S3 without needing a full_path

This class can now be selected with the new `PRIVATE_STORAGE_CLASS` setting.

The default `private_storage.storage.PrivateStorage` class now points to
the class that was imported through the new setting, theirby preserving
backwards compatibility.

- Added get_path()
- Added get_private_file()
- no longer depend on `self.kwargs['path`]`.