Polishing Interactions with Bazaar

As we get closer to a 1.0 release of Bazaar, we are going to want to work more on the user-visible polish of the project.

We should come up with "user acceptance" level tests, or at least basic use-case scenarios, and review the errors and user feedback that bzr gives.

Some of this could become blackbox tests, this spec is more focused on writing down the use cases (especially error conditions), and making sure that the output bzr gives is actually understandable.