Initial commit.
Implemented remaining SFTP functions. Untested.

Added a total list of SSH functions including those we've already implemented.
Formalized TODOs. Added list of pending tests.
Added references for all SFTP. Added adapters.

Adapters are the primary library API for external callers. They translate parameters to proper types, and failures to exceptions.
Finished debugging. Added with()'s and wrappers.
Host-key calc and printing works.

Also added a callback for host-key authentication.
Re-enabled file-listing output.
Merge branch 'master' of github.com:dsoprea/PySecure
Renamed README.