Allow for comments to be left and/or read on an artifact's discussion
Juggle parameters around, so `discuss show` and `discuss add` become subcommands
Merge pull request #38 from Two9A/master

Discussion reading and commenting support
upgrading package q because of this bug:
https://github.com/kriskowal/q/issues/252
fixing error treatment when this is the first discussion note of the artifact.
little more friendly display :)
friendly message where there is no discussion going on.
releasing version v0.6.0