Support for SSH key pairs

[JoeZiminski]

Thanks for this excellent package for syncing folder trees, it is exactly what we need for our project.

We want to use the private_key argument on pysftp.Connection for SSH key pairs previously configured using paramiko. I am planning to fork the repo and implement this, if it will be useful I am happy to do it as a PR, or maybe there is aready a way to do this that I have missed (we are planning to provide cross-platform support so would rather avoid using system keyrings).

[mar10]

Hi Joe,

these arguments to pysftp.Connection are currently not used, but it would certainly be a good enhancement!

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