Updating v2 Role class code
Fixing up tests, removing some of the yaml error stuff from parsing

* moved old unittests for vault over to the new codebase
* reverted YAML error helpers and reverted the load() function
  in parsing/__init__.py, pending a rewrite of a new YAML loader
  class of some kind to encapsulate all of that
* fixed an error in in the module args parser regarding the shell/
  command argument parsing, where some additional arguments were
  being lost