Rust bindings for Lunatic's stdlib

This library contains higher level wrappers for low level Lunatic syscalls.

Currently it requires nightly.

Example

Create 100k processes and calculate the power of numbers then send the results back to the original process.

```rust use lunatic::{Channel, Process};

fn main() { let channel = Channel::new(0);

for i in 0..100_000 {
    let x = channel.clone();
    Process::spawn(move || {
        x.send((i, power(i)));
    })
    .unwrap();
}

for _ in 0..100_000 {
    let (i, power) = channel.receive();
    println!("Power of {} is {}", i, power);
}

}

fn power(a: i32) -> i32 { a * a }

```

Compile your app with:

cargo build --release --target=wasm32-wasi

and run it with

lunatic target/wasm32-wasi/release/<name>.wasm