forcing installation of plex-archive-keyring package and an apt-get update prior to installing plexmediaserver
modifying server_ubuntu recipe to use new resource notification syntax

old habits die hard
add apt dependency to metadata
Merge pull request #1 from cwjohnston/repo-key

forcing installation of plex-archive-keyring package prior to installing plexmediaserver
Merge pull request #2 from danryan/chore/apt_dependency

danryan:chore/apt_dependency