Add Pyobjects (formerly NaCl) to Salt

This adds a new renderer `#!pyobjects` that provides an object based interface for building state data.

See the following for more background:
* https://groups.google.com/forum/#!topic/salt-users/5frdabVwAdE
* https://github.com/borgstrom/nacl
* http://borgstrom.ca/2014/02/15/building-a-pythonic-interface-to-saltstack-states.html