No longer need Renderer.
Update README.
Remove smell instance variable.
Remove EventLoop; rolled functionality into Application.
Overhaul application launcher and main loop;

- Allow optional `—run-once` command line argument.
- Provide `—version` and `—help` command line arguments.
- Use loop instead of while; allows removal of Collapse exception.
Merge pull request #29 from gavinlaking/twerks

Overhauling the application launcher.