- adds pixi.js to index.html
- adds a new game.js to src/
- Rewrites the Connection Actor so that it spins off separate `Retryer` actors for messages we want to retry.
- Deletes the ConnectionService class hierarchy because it was useless at this point.
- Implements what the old kinetic.js code did with Pixi.js.
- Improves the client-side connection code's ACK handling... it still needs some work. Currently, it will break under certain cases.
(#3)