Combine command and validator tests into single test class.
Begin unit testing domain security commands.
Ensure testibility of various domain security commands.
Ensure testibility of various domain security commands.
Ensure testibility of various domain security commands.
Ensure testibility of remaining domain security commands.
Verify unit testability of service artifacts.
Fix bug #271.
Rudimentary draft implementation of SignalR eventing infrastructure:

- installed SignalR nuget dependencies
- Created test Guestbook controller, view, and hub
- implemented rough draft version of eventing infrastructure
- added entities for guestbook data