Urbit utilities

To use the pill evaluator example, get a valid urbit pillfile from
somewhere, eg

    curl -o urbit.pill http://bootstrap.urbit.org/latest.pill

and then do

    cargo run --release --example urbit -- urbit.pill

## License

Licensed under either of

 * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)

 * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
additional terms or conditions.