Problem: Make the Automation Tools take advantage of Python Setup Tools

Per: https://github.com/artefactual/automation-tools/pull/46#pullrequestreview-98024212 and (http://python-packaging.readthedocs.io/en/latest/command-line-scripts.html)

Additional comments from @sevein here: https://github.com/artefactual/automation-tools/issues/47#issuecomment-367445845
