Test: CLI: Launch

[davidfstr]

The CLI has limited automated test coverage. Yet it is an important interface.

LaunchTests:

• [ ] (nothing) –– test can launch
• [ ] --readonly –– test can launch defaulting to read only open
  • Related to bug #63
• [ ] <project_dirpath> –– test can open project as writable
• [ ] <project_dirpath> --readonly –– test can open project as read only
• [ ] <project_dirpath> --cookie –– test can open project with cookie and download resources with cookie
• [ ] <project_dirpath> --serve –– test can open project and serve immediately

This issue was extracted from #64