Sshepherd

Minor version update:

- subprocess calls replaced with the paramiko ssh library
- pytest-based tests added
- extras_require ['dev'] added to setup.py

This version also available via pypi `pip3 install sshepherd --upgrade`


v0,1
**For release specific information please see documentation in the `docs/` folder or the wiki.**

* Major Features:
* Query users by host(s)
* Create new ssh user accounts on host(s)
* Run arbitrary commands on host(s)

* Limitations:
* Assumes your user account has privilege on target host(s)
* Assumes target host(s) do not prompt for password when using `sudo`
* Assumes your user account authenticates with target host(s) using the default ssh key file at `~/.ssh/id_rsa`