v0.8.0-beta.0

With this release, we're finally declaring Gort to be minimally viable. You can deploy the Gort controller, create and install command bundles, manage users, and trigger commands via Slack.

This does NOT mean that it's feature complete! In fact, it's still missing some very important features (dynamic command configuration and templates are particularly glaring). These will be implemented over the next few months.

Just a few updates in this release:

• Added some missing functionality for managing profiles (#71)
• Fixed a bug in which alternative profiles wouldn't work on the command line (#75)
• Removed the entire concept of default bundles, since they added quite a bit of complexity for very little value (#41)
• Added "long descriptions" to bundle commands, and made !help COMMAND output it (#70)