Milestone 0.2.0

Feature release:

• Reasoner/Inference? Engine
• Finish the Graph API:
  • appending whole subgraphs of nodes as a Hash
  • contexts
  • transactions
  • subgraphs (if they work)
• Finish implementing W3C tests, and figure out why the ones that fail are failing.
• Finish work on Archetypes system
• Handle encoding of literals (maybe only under 1.9.1?)