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Add Python 2.x  support for DjangoStreamingServer serve() method

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.

Support reverse() import change

fix UnicodeDecodeError with cyrillic file names

change to old-style classes for python 2.7.5

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

fix PRIVATE_STORAGE_AUTH_FUNCTION path, fixes #6

Fix import reverse

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