Add support for scp(ssh) protocol

[val314159]

This would be pretty useful to copy from generic shell accounts to S3 and vice versa.

[piskvorky]

Yes, I can see how that is useful.

Python's fabric library has good support for this kind of thing; perhaps we could build on top of that?

Are you up for a pull request @val314159 ?

[val314159]

Yeah, i hadn't thought of the exact mechanism, I figured the most dead simple way would be just to shell out a command.

fabric might be overkill, there's also this: https://pypi.python.org/pypi/scpclient
They're both front ends to the paramiko library.

Here's a one pager that might be even simpler:

• http://code.activestate.com/recipes/576810-copy-files-over-ssh-using-paramiko/

Let me play around and see what I can do - it should be fairly straightforward.

[piskvorky]

Perfect -- the simpler the dependencies, the better!

Thanks for offering the exploration / help. Feel free to open a PR for review once you have something reviewable.

[ziky90]

This is a good idea and it would remove my need of issue #33 which I was about to implement.