updating chef automator plugin with new plugin registration fields, merged in some minor upstream changes
fixed outdated documentation regarding automator skeleton method inputs
docs for plugin registration
Merge remote-tracking branch 'origin/develop' into feature/doc-plugin-registration

Conflicts:
	docs/docs/source/guide/admin/plugins.rst
corrections per PR feedback
Merge pull request #116 from continuuity/feature/doc-plugin-registration

Feature/doc plugin registration