Fix a verbosity bug
Preparing v0.0.20
allow output verbosity to be set by symbol, Logger or integer
allow output verbosity to be set by symbol, Logger or integer
move netssh configuration to class level
Update README.md, fix image paths.
resolve issue with default formatter
Preparing v0.0.21
Switch to https://rubygems.org source.
Remove autotest dependency
Implement a set of logging functions.

Within the context of an `on()`, one can now call `debug()`, `info()`,
`warn()`, `error()` and `fatal()`.

These pass an instance of `SSHKit::LogMessage` to the formatter. These
*LogMessage* instances respond to `#to_s` and are ignored by the *dor
formatter*, rendered prefixed with their verbosity level by the pretty
formatter.
More Logging
Add another wishlist item
require log_message
Add rudimentary upload!() and download!() implementations, logging leaves a lot to be desired, but it's working at least
Remove emacs modeline from the Vagrantfile
Improve tests for upload!
Preparing Release v0.0.22
Preparing Release v0.0.23
Enable streaming stdout/stderr in the pretty formatter