Merge pull request #57 from terminalmage/master

move yumpkg.py from salt to salt-contrib
Moving nzbget to salt-contrib
Merge pull request #59 from techhat/master

Moving nzbget to salt-contrib
Rename yumpkg to yumpkg_api and refactor

This takes the newly refactored yum API-based pkg frontend and renames
it to yumpkg_api, and hides it behind a config option.