* added optional alias parameter to single clients and HostConfig for configuration from parallel clients.
  This is useful for weird ssh proxies like cyberark PAM.
  Without this, it is difficult to identify the source of the output, as they all have the same host name.
* Added tests.
* Updated docstrings.

* Performance improvements for reading output in all clients.
* Output reading for all clients has been changed to be less prone to race conditions.
* Parallel clients now read a common private key only once, reusing it for all clients it applies to, to improve performance.
* Updated changelog.
* Added test case for joining on parallel clients without ever running run_command. Updated join so that it does not raise exception in that case.

* Changelog syntax changes
* Updated setup.py dependencies
* Updated docstrings

* Fixed issue with stdin flush for libssh clients
* Updated changelog
* Updated sshd template
* Updated versioneer
* Updated logging
* Refactored tests, imports
* Updated CI cfg
* Updated docstrings
* Updated imports
* Updated readme
* Prettify tests

* Updated rtd configuration
* Added doc requirements file
* Updated dev requirements file

* Fix socket shutdown on disconnect - resolves #274 
* Updated tests
* Updated clients, changelog
* Move disconnect to internal function
* Refactor ci tests. Updated disconnect on clients
* Refactor for keep alive
* Added example script
* Updated setup.cfg
* Updated tunnel socket failure tests. Added tunnel test.
* Added shutdown tests, updated changelog
* Updated tunnel

* Deprecated execute function on single clients
* Added test
* Updated changelog