+ - Python (2.7 or later, or 3.2 or later)
+ - Python six, a Python 2/3 compatibility library
+ https://pypi.python.org/pypi/six
+ - boto, the python interface to Amazon's Web Services (for S3 storage)
+ http://code.google.com/p/boto
+ - paramiko, SSH2 protocol for python (for sftp storage)
+ http://www.lag.net/paramiko/