Commands Overview

• Document commands
• Add unit-test framework
• Add support for introspection of database state
• Add tests for each of the commands:
  • login
  • logout
  • observe
  • unobserve
  • create
  • delete
  • update
  • move
• Add serializer/deserializer tests
• Evaluate persistence strategy (when is data persisted)
• Change eXpat to pugixml in a submodule (consider using json instead?)